Two Gamerz has been experiencing this due to the creator having to balance college along with two comic strips at once.
Achewood has been falling into this for a while, with multiple days between each update and the author repeatedly pushing back his own deadlines. Eventually, he just put it on hiatus, with strips coming out once every several months.
Adventures In Ninja Cookery (not to be confused with The Adventures of Dr. McNinja) never had an official schedule, but the author said he would try for once a week. Updates have taken as long as fifty days to be released.
Alice was last updated on July 7th 2006. There has been talk about perhaps restarting it, but it's not looking good since the update of a revival was in June 2009.
Alpha Luna: lycanthrope drama, old-school monochrome linework, full-page format, weekly updates... with unscheduled pauses that can last half a year or more.
Angels2200 has gone through periods of dormancy over the years; the current one started in July 2011 after an announcement of family health issues. One strip was posted in December, and since then, silence on all fronts.
Antihero For Hire still sticks to its schedule, but... back a few years ago, Mark Shallow was updating Antihero For Hire 3 days a week, and Adventurers! three days a week. Now, Adventurers is over, Antihero for Hire updates twice a week, and the comics are about half the size they used to be, usually only 3 panels.
AppleGeeks Lite updates every Monday, Wednesday and Friday without fail (though it was only Wednesdays and Fridays at first, the first Monday comic being #49). The main AppleGeeks, however, updates erratically at best - and has been reduced to only a single issue per week. As a result, despite AG Lite beginning in 2006, three years after the main comic, the thousandth overall comic was AG Lite 476 (Wednesday, June 24, 2009)—almost half of the overall output. In fairness, a black-and-white comic strip is considerably easier to make than a full-color, full-page comic.
From Bad to Worse. In late 2010, updates started to become sporadic at best until Haque finally put the comic on hiatus.
Painful in Avalon, where the strip, meant to run on a three-year schedule corresponding to school years, suffered numerous delays in the final year, forcing the author to backdate new strips, until giving up and writing a "strip" saying in text what happened between the most recent strip and graduation. And even that was lacking, especially compared to what was given to the readers before.
Axe Cop entered into a hiatus in the summer of 2012 when the production of the Axe Cop television show overtook the strip's production schedule. This also led to the author's other webcomic, Bearmageddon, going on hiatus as well (after its schedule had already led to some update delays and a drop of two pages a week to one.)
Beyond Reality updates so erratically, schedule slip may no longer be applicable. Currently (early October 2009), it has not updated since July 20, and "regular" schedule is about once a week to once a month.
Blip had been going since the beginning of 2008, and only in spring 2011 fell behind due to a combination of computer ills and a probably much needed vacation for Sage. Comics still update daily, but the dates are now off by about a month.
And now, as of fall/winter 2011, months can pass between updates.
Butternut Squash once had a fairly regular weekly update schedule. But since 2007, instances of guest comics, filler art, and seemingly-endless piles of excuses and pleas for patience courtesy of the creators have become the norm rather than the exception. This has led to some fairly tense exchanges between the creators and readers in the comments section under each sporadic-at-best "update."
Cat Nine for Take Two, the schedule has slipped from thrice a week to just once a week, sometimes he'll miss a week plus it updates on random days. Most of the time the delays are caused by stuff happening in life or school. Recently though it seems that he's going for updating once a week on Sundays.
Chopping Block has had several of these throughout its run, many of which last several months. At the end of one such hiatus, there was a short set of strips involving Satan looking for Butch (the star of the comic). Another schedule slip caused that to become an Aborted Arc. One example: February 21, 2008 to January 2nd, 2009 - eleven months.
Captain SNES went for about a year in the middle of Act 3 without any substantial updates, except for a few filler strips, before resuming. Particularly frustrating since it has one of the most complex plots of any sprite comic around. Fortunately, 2011 was a completely different story...
Casey And Andy had several very long hiatuses during its run, although it has now ended for good.
Chugworth Academy had multiple slips in its MWF update schedule before stopping to update for almost two years. A series reboot lasted three strips, never to be updated again to this day.
Metal Gear Solid fan comic The Cobra Days started out as a Monday/Wednesday/Friday comic with occasional misses, slipped to three or four comics a month... then one or two... August 2008 saw the posting of the fourth new comic of the year.
Officially cancelled as of January 2011 after almost 11 months of sitting stagnant.
College Roomies from Hell!!! had a strong seven-day schedule for several years, then dropped off to five per week, then three, and now the last schedule has become unreliable as well.
Clay Yount's Rob And Elliot, was originally running twice a week, then knocked back to once a week one to support the launch of Cosmobear (now an Orphaned Series). Despite the latter not updating for over two years, Rob and Elliot still stayed at its purported once a week schedule, then grew increasingly sporadic about whether it would update each week or not. The artist and writer finally killed it off for good in June 2012 with a simple gag strip that claimed the characters had now reached the zenith of comedy and could no longer continue.
Cosmic Hero, Ace Sparks -the author- on his last updated promised he would keep on updating soon... that day was the 20 of November of 2008.
One member of a similar contest to the Daily Grind mentioned below which had previously had a really bad history of schedule slips was Elf Only Inn. When it finally slipped after a rather good showing, the Lazy Grind runners were a bit slow to mark it off on the page, while some people mused in the shoutbox on the Lazy Grind page that, now that there had been a single slip, the comic creator (Sortelli) would probably not update for months. The shoutbox was removed and replaced by a temper tantrum by one of the Lazy Grind staff. In the end, Sortelli proceeded to not update Elf Only Inn for months immediately after his slip, and continues to post an average of one comic every three months or so.
To make matters worse, apparently the Grind itself has had a bit of a schedule slip. Kell Hound apparently won the contest when its last fellow competitor missed an update... back in April of '08. (Example added in August of the same year.)
Lazy Grind itself has finally been taken down, but it exists (somewhat) on the Wayback Machine.
Dragon Tails. The original run of 2000 comics never had a late one. Then the author ended it, then restarted it, and ever since the update schedule has become entirely random and unpredictable.
Dresden Codak is exceptionally bad at this. The update schedule was completely random until the author promised weekly updates as part of making the comic his full-time job... upon which the update schedule continued to be completely random. Following the announcement, the next comic took six weeks to arrive, and since then the strip has been updated about once every twenty days. The fact that the author was in an accident that has left him unable to draw and broke his computer, erasing the sketches he had in progress, putting the series on temporary hiatus. Few noticed.
Lately the comic has reached epic proportions of slow updates. Now its a near-certainty that you'll have to wait several months or more for another comic. But when the next one comes around it's usually worth the excruciating wait.
Brian Clevinger generally did a solid job with 8-Bit Theater, but interruptions and delays popped up not infrequently. Hurricanes would hinder the Sprite Comic a couple times every year (Clevinger was based in Florida for the first decade of the strip's history) and there were usually a handful of personal crises that pushed back publication for a short time. Bizarrely, as the strip neared its end 8-bit Theater was increasingly erratic in its update schedule, sometimes missing entire weeks.
Clevinger grew defensive after one of those update-less weeks, the result of computer issues at his new home. I've given you eight years of some of the most consistent* work you've seen online. I don't think it's unreasonable to ask for a little patience from you here, in the final hours, when I miss an update for the simple reason that it's impossible to make one. Thank you. He did say in the asterisk footnote that "terrible work is still consistent work."
His other webcomic, Warbot In Accounting, however, is hit by this hard. First it was updating once a week, but quickly spiraled into "once very few months, if you are lucky." Supposedly this is because the artist has terrible luck and either loses all of his work or has severe financial problems. He seems to have learned from this however, as his other other webcomic is openly stated to have a one-month buffer, and will update on Mondays and Fridays, no exceptions.
Clevinger's case is somewhat amusing in the sense that the vast majority of his delays are caused by a Plague of Good Fortune. Specifically, it seems every time he makes progress on a project his various partners become too busy from other obligations (that actually provide a means of paying the rent, unlike the released-for-free Warbot and HIKYM) to actually do anything with Brian's projects. For instance, Zack Finfrock became busy with art commissions he pays for his lifestyle with and later got a job as a host of a webseries, and the co-writer/artist (can't remember which) of HIKYM got hired to work on actual print comics. Clevinger himself has his own highly popular print series to contend with, as well as the fact that Marvel has thrown him at least two miniseries to write for in the last year.
El Goonish Shive went from updating every day, to every weekday, to Monday-Wednesday-Friday, to Tuesday-Thursday-Saturday, to at least 2 days per week with a filler. There are also several occasions where months passed between story updates due to problems in Dan Shive's private life. The worst slip was from September 2007 to January 2008, while Dan Shive was learning to color his strips with his new art style. The strip briefly went back to a regular Monday-Wednesday-Friday schedule, only to revert to filler and a new schedule which, in turn, collapsed. Another abortive attempt at Monday-Wednesday-Friday was made, but Dan's tablet PC (which he uses to draw) died, and we were in limbo before settling on another schedule (Tuesday-Wednesday-Thursday), and NP was revived.
NP is officially dead (claiming to go on a one-week hiatus, but hasn't updated in years), but everything else is still good.
Starting in April '11, Shive started inverting schedule slip. HeINVERTEDSchedule Slip. Yes, he has missed a couple days due to tech problems, and people demanding a sketch of a certain panel, but he's still holding strong as of this writing.
He had a brief relapse into Slip territory in 2012, but as of 2013 he's actually gone back to four or five story comics per week, an update rate not seen in years.
The End Of Things last updated June 16th, 2010. After being on hiatus since November 18, 2009. And it was rather sporadic before then too.
Prior to getting its own site, Erfworld claimed to update three times a week on their comic page, but actually updated three times a month. It's an egregious example because it started out being hosted on the same website as The Order of the Stick and was originally brought in to compensate for its Schedule Slips.
The webcomic adaptation of Erika's New Perfume just sort of updates when it will, though it generally updates every eight days. There have been slips in this though, which wouldn't be too bad except it's only 9 strips in. Still, it so far seems more reliable than most.
Everlasting Wanderers started in 2002 with a 2-per-week schedule. It kept this for nearly a year, then slipped into once per week, then once a month... then once every few months. Then the website it was hosted on disappeared and it seemed to vanish from the web, only for the author to have reposted it on his deviantart. The longest break between comics has been 3 years. It's more or less considered an Orphaned Series, although it a new comic seems to have come out once in a blue moon. The author lampshaded this with his latest update: "see you next year!"
Exterminatus Now has suffered this steadily. Now it updates weekly at the weekend, though it's still spotty at times.
Often invoked by Femmegasm due to Robbie Allen's frequent health problems. A particularly nasty one came in July 2012, when a seizure resulted in him losing feeling in his arms. He often fills the void with fanart.
The Foxfire Chronicles is lucky to have two updates a month. As of this December 2011 edit; the last update to Foxfire Chronicles was March 6th 2011.
Girly had a regular schedule once upon a time, but (as of the final chapter) updates as pages are finished. The author, Josh, acknowledges this and often apologizes on his Twitter, and took a stab at himself in this update. http://girlyyy.com/go/760
Goblins has run a bit late pretty much since the creator refined his art style back in Book One, but four days late was considered unheard-of and newsworthy when most of the party came to Brassmoon. Two years and eleven months later, the Brassmoon story arc finally came to a close. Updates a week late were practically the norm for most of that time, until Thunt made the comic his full-time job.
In March 2009, in response to emails requesting him to just post what he has instead of trying to make it perfect, Thunt published a series of blank panels.
It's now stabilised at a page Tuesday and a page Friday. But the donation-bar comic, Tempts Fate, has been stalled for more than two months as of Nov 3 2010, and is almost invariably late otherwise.
Gone To Ground is notoriously bad at updating on a schedule, mostly because of its extremely detailed art style. On the other hand, the author is a good sport about it, with a banner on the site cheerfully proclaiming "updated bi-monthly."
Hanna Is Not a Boy's Name has gone on short hiatuses a couple times, and the author often apologizes for being late or worries her readers will get spoiled when she does stick to her schedule. There were a couple long gaps in between September and October due to illness and relocating to a new state, but updates seem to have picked back up.
...Aaand have slowed down again to about one or two comics (or related drawings, like the Valentine's cards) per month since December 2010.
There has, as of December 2011, been no updates to the site since mid-February, and no actual comic updates since the end of January.
Andrew Hussie has an extremely ambitious update schedule with Homestuck. (There's a reason why MS Paint Adventures is the longest-running webcomic ever despite only being a few years old.) However, there have been many cases of flashes and important events coming out much later than they were planned - of course, these almost always happen because he realises he wants to write a lot more in between, and almost invariably the webcomic still update in the meantime. However, straighter examples have happened a few times: the whole comic was put on hold for over a month to create Cascade (it should be noted that the general fandom reaction is that it was worth it), and a couple of times in 2012 Andrew has halted updates for a couple of days to work on merchandise and the official books.
A completely unavoidable example happened with the second intermission - it, as an appropriately creepy flash, was supposed to come out on Halloween, but a freak snowstorm blew into Andrew's city, cutting out all power for him for a few days. He was not happy about it.
The MINISTRIFE!!! flash in Act 6 Intermission 3 was intended for a Halloween release as well — a huge number of characters gather together, wearing a great variety of outfits, the gathering is mistaken for a costume party several times, and Damara asks "What's this? A Halloween orgy?" This time, the update was delayed by Hurricane Sandy, which flooded the server building in New York and brought the whole site down.
Instant Classic and Genrezvous Point alternate between 10 strips per week (seven IC, three GP) and posting nothing for months at a time. To be fair, the artist is a filmmaker and his bursts of "inactivity" are usually when he's working on a project.
As of November 2009, Carroll seems to have jumped back on the comics bandwagon for good, though only time will tell.
Lackadaisy Cats' update schedule is probably the only legitimate criticism that can be directed towards the comic. Rolling in at a little under 100 strips in 4 years (2006-2010) in the form of sporadic updates every few months, Lackadaisy's periods of inactivity drove some fans to declare the comic legally dead only to be proven wrong time and again. Luckily the comic has been updating with something resembling regularity since 2010, presumably when the comic was picked up by a publisher and became a meaningful financial venture rather than a pastime. Many fans agree that the new update schedule (roughly 4p/month) is perfectly acceptable given the jaw-dropping quality of the art and writing remains the same, which it has.
The comic has slipped again, hard, with the the last two updates for actual story pages being in August of 2012 and February of 2013.
Leve L updates as infrequently as once a year. The readers keep assuming it's finally become an Orphaned Series before being proven wrong.
The Life of Nob T. Mouse had a major bout of this when the series went on an unannounced hiatus between the final part of the Nasties! storyline in 1999 and the first episode of Pie Noon' in 2007, i.e. eight years'' later.
This will hopefully not happen anymore however, since the comic reportedly now has a Strip Buffer.
Lewis Lovhaug's webcomic Lightbringer was always sort of erratic in its update schedule, often posting filler strips and missing the Wednesday update, and in December 2011, posted its first update in over a year.
This is ironic when you consider that Atop The Fourth Wall itself is well known for having probably the most consistent schedule of any Channel Awesome series (in four years, Lewis has missed his self-imposed Monday night deadline less than a dozen times and actually skipped a week only once or twice).note This isn't counting the weeks where Lewis decides to riff on public domain PSA films from The Fifties in place of reviewing a comic book; hell or high-water, something from him will get uploaded Monday night or Tuesday morning.
Life on Forbez updated once a day for a long time before updating less and less before going on long hiatus. It took almost 10 years to finish the first big story arc. The fans (and the author) know that updates can be fleeting. Since then the updates have become more regular.
Little Worlds updated twice a week for the first few months, then lapsed to once a week, then went a multi-month hiatus (without warning or explanation). It has since returned and begun posting once a week again. The head writer, Peter Chiykowski, claims that University got in the way.
After some slip ups, earlier this year Living with Insanity took a two week long break while Herbert was away and Salvi was working on another project. It was supposed to return February 8th, but didn't come back until early March, this time at two updates a week, which can be hours late. They did an arc on Herbert's frustration over this. But other than that, it hasn't missed an update since the schedule change.
The Longest Sojourn fell into a year of non updates in April of 2006 before finally getting sporadic updates in 2007, and getting slightly less sporadic updates from April 2008 onwards.
Much like the Pokémon-X example from later on the page, John Joseco also insists on having The Lounge pages appear on the days they were supposed to. The last page (Which has been up for months) was February 16, 2009.
This is mostly because JJ has become rather obsessed with a different series, although even there his art has become infrequent of late.
L's Empire is a strange example of this trope. Why? Because the authors weaponized it! Dark Star had become an author and, as a result, he could see the strip buffer. So the authors purposely posted the page showcasing his defeat late to keep him from planning accordingly.
They were already suffering from this, which was lampshaded in both the first and third anniversary specials.
The Meek: Schedule Slip: The author got a new job and after 01/03/12 no new pages were released until 10/15/12. The comic continued to release regularly once a week until November, upon which the author suffered a colossal Creator Breakdown and not updated since.
One of the major criticisms of MegaTokyo is its erratic update schedule. On a good month there might be two of twelve scheduled comics produced. This is particularly grating to critics who claim that the "simpler" artistic style - light pencil drawings - suggest a sacrifice in artistic quality for the sake of regularity... which means it fails on both accounts. Naturally, there's a lot of detail in those pencils, so it can be argued either way.
Also worth noting is that Fred Gallagher, writer & artist of Megatokyo, decided to quit his job and make the comic itself his profession. (Way before Dresden Codak did it.) However, unlike Dresden Codak, the update schedule didn't remain the way it was after Fred started devoting all his attention to it... it got worse.
Since the birth of Gallagher's son, updates have become even more infrequent and unpredictable, with the average as of the end of 2008 hovering somewhere around one comic per week. The creator even changed the schedule to a two-per-week Tuesday/Friday schedule, and he can't even keep that up.
From Bad to Worse – as of 2010, a quick peek at the archives page shows the update schedule is down to 2-4 a month or worse, with frequent delays. This, combined with Webcomic Time means that a casual reader can check in on it once or twice a year and not miss much.
And worse. Piro's rant from November 2010 reveals one of the reasons for the most recent horrible schedule slips – Sarah, the real life Seraphim and Fred's wife, was diagnosed with lymphoma. Despite her reasonably upbeat attitude, the impact this had on the comic's updates was profound.note To put this into perspective, Fred started the current chapter in June 2010 (when his updates had already deteriorated to about one comic a week). In the nearly three years since, there have been a grand total of just over 80 story comics, and he's not even close to any sort of resolution. August 2011 was the last month to have more than four updates; December 2011 (and 2012) only saw sketches posted; March and April 2012 had only one comic apiece; May 2012 had four comics but June 2012 had no updates at all; 2013 has so far averaged about one comic every two weeks. In real time, Piro and Miho spent nearly fourteen months in the public bath-house, a sequence that lasted around an hour or less in-universe.
And even worse. Fred revealed in March 2013 that he had developed a heart condition that requires going in for major surgery.
Modus Operandi, a fairly new comic that began in mid-November of 2010, managed to post seven updates before stalling out in mid-February. A four-month gap has finally been ended by a new comic posted in mid-June. Subsequent deadlines have been missed. No word on when (if) they'll go back to regular updates.
A Moment Of Peace experimented with a 'whenever' schedule after the author found she produced more over a Christmas break when there were no deadlines. After producing a lot of comics under this new schedule, the comic went back to a Thursday-Sunday pattern.
MSF High has suffered from this a good few times, and has actually orphaned the previous version, HSCM, twice.
Neglected Mario Characters from 1997 until around 2004 updated regularly on a generally weekly basis. But after the creator graduated highschool he got less and less time for the site, and eventually vanished completely without any signs of what happened to him. The last six years or so have basically been nothing but comics made by fans wanting to continue all of the many stories he left hanging.
Not likely. Its main page has been declaring a temporary hiatus since July 10th of 2008.
Starting in October of 2010, the site saw a flurry of updates that were scheduled to bring about the conclusion of the story in January. Schedule Slip happened again, more than once, and the final page wasn't posted until March 17th of 2011.
Around late 2012, Erin Mehlos fell behind on her Strip Buffer for Next Town Over, partly due to having her first child. She decided to start posting a side-story vignette called "Genevieve" with a simpler artstyle and monochrome coloring while she built her buffer back up.
No Pink Ponies still claims to update 4 times a week, but there hasn't been a new strip since mid-January (2008). The author announced in mid-April that he was "bogged down by multiple other jobs", which were to be done by the end of May (''Marry Me'' only finished in late June).
NPP was going again for a while, with the author promising to post a strip a day to make up for the break. The revival so far (as of Sept 2008) has consisted of 9 regular strips plus one "Sunday" strip, a news post from the author promising not to take a planned month's break, then an 8 week (and counting) hiatus...
No Rest for the Wicked has repeatedly fallen into long, unannounced hiatuses since 2008, each one long enough to make it appear to be abandoned...right before it comes back from the dead again.
Not in My Backyard! started off on a schedule that, while somewhat irregular at times, averaged out to a reasonable number of strips per week. However, there were no new strips between June 16 and July 3, 2000, and from then until January 2001, there were only 17 updates (including only one strip between August 7 and October 3). The strip finally got back on something resembling a schedule in 2001, but abruptly ended that August.
The Order of the Stick once had a fairly strict three-times-a-week schedule. The author reportedly has a chronic illness, which lead to an "updates without warning" schedule hoping to average out to three times a week.
Before his "unspecified chronic but non-life-threatening" illness progressed to the point where it could randomly leave him bedridden for weeks at a time, he was extremely consistent, to the point of occasionally apologizing for being an hour or so late.
After a long hiatus because of a thumb injury, the characters broke the fourth wall about it, with Elan insisting on providing a recap comic since it had been so long for the readers.
Ozy And Millie once updated every weekday, Monday through Friday, with minimal interruption. Towards the end, the comic updated irregularly; creator DC Simpson attributed this to waning interest. The series has now semi-officially ended: the main storyline has met a satisfying conclusion, but occasionally Simpson updates the site with a new drawing, and she has left open the possibility of more stories in the future.
Fans of PAWN had to wait 2 friggin years and for a site move before Anderson finally posted some new pages.
Peter Is The Wolf has a once-a-week schedule; due to the writer and artist working on the pages separately, both of them having other projects to work on, and the comic itself generating little to any revenue for the creators, it's a pretty frequent occurrence to find out that a page is being delayed for the week.
Planet Zebeth had a fairly regular MWF updating schedule, along with several bonus strips celebrating anniversaries and the like. Activity has dropped off, mostly due to Real Life, especially when the author gets new video games, which is often explicitly stated by Kabutroid himself to the other characters. It also doesn't help that he's had to re-install Linux several times throughout the run, which actually drove a few story arcs.
Pokémon-X insists on dating the comics on the days they should've come out (M-W-F update schedule)... which means that on March 20th, 2009, the next comic to have gone up was dated December 1, 2008. Yeah.
To make things worse, the author has also begun writing the newsposts to go with when the comic should've come out. As of March 2010, the newsposts are anticipating the author's return to school in August 2009. This is especially ineffective in regards to announcing the author's appearances at conventions that happened half a year ago.
Pokey The Penguin didn't see a single update in 2009. As of July 2010, the comic is updated daily again.
Post Nuke hasn't updated since New Year's Eve 2010. The author's still sending us "news" type updates, though.
Punch An Pie has it so bad that there was practically a revolt in the journal comments section. New strips were originally promised in November, after delays ongoing since May. In December 2011 it was announced that the artist would be taking over writing duties as well. In January the artist announced he was working on the strips and would restart once a buffer had been built up.
The Saga of Earthsong started out at two days a week before running into occasional hiatuses. It now painfully creeps ahead at about one page a week, made only the more excruciating because two years into the comic's storyline, a publishing deal led the author to decide to * completely* reboot the entire comic...publishing at an even slower pace then it originally started. So despite cutting a tremendous amount of filler and excess exposition, the update schedule means the comic has actually taken * longer* to get to the exact same point in the storyline that it was at when the story was rebooted.
Scandal Sheet! seems to alternate between periods where Troy Smith swears he's turned over a new leaf, has a Strip Buffer going, and sticks hard to a thrice-weekly schedule for a few months...then declines...leading to month-long (or longer) gaps in the archives - and then he's back, "No really, I mean it this time!" This would be far less frustrating if Smith didn't like to write enormous, extended story arcs that take months of real time to complete even with regular updates.
Although lately it seems the comic is more-or-less dead, with the last installment being dated Feb 16th 2009 and nothing since (despite posts from Troy claiming an imminent comic in April, then May, then late June, with very little heard from him since)
Secret Of Mana Theater has had this happen a lot in the last few years. Heck, one of the bouts lasted almost three years before the series updates again. Now there seems to be another snag that's been hit, as the series hasn't updated again for the last four months.
Shadownova has missed a couple of updates in its MWF schedule so far but this is always followed by an apology, explanation and several pages uploaded at once to cover the missed updates.
Sparkling Generation Valkyrie Yuuki, always erratic at best, has gotten even worse now that the artist has shifted her attention to her paywalled erotic comics site, not that you can blame someone for prioritizing something that helps pay the rent.
Stage Select When Robot Masters Attack, suffers greatly of this.
Hell, he's even altered the banner so that instead of saying "Updates Monday" the text after the VG Cats part changes to things randomly selected things like "Error 404, Update does not exist", "I can't believe it's not Updated" and "Probably Not Updated Today" and quite a few more. His girlfriend has claimed on her website that Scott actually does write around a comic per week, but is often dissatisfied and discards them.
Fantasy Realms started off as a free comic, turned into a Wirepop launch series, gave a few months of regular updates, then fell into a black hole. It departed the site and has rarely updated despite multiple promises of new regular updates.
Similarly, Directions of Destiny ran three chapters, moved to Wirepop and started a reboot, then left Wirepop and stopped updating for two years before finally updating a few times in 2008. Occasional updates to the site indicate that the author wants to continue, but so far, in spite of occasional trickles of concept art, the author's personal life has completely eclipsed the comic.
Both The Wotch and its spinoff Cheer!! had a highly erratic schedule that could drop out for months at a time without notice, and even in normal times easily missed half their updates on a poor week. Then The Wotch crashed entirely, due to Creator Breakdown. It returned after more than a year with a new artist, and has managed to continue on roughly weekly. In the meantime, Cheer!! stopped updating only returning for one strip after more than a year before finally fading away
WTF Comics has, at times, gone for months without an update.
Xylia Tales. Classic example – regular updates gave way to irregular but frequent, then to less frequent, then a two-month pause, and then an official "hopefully" one-month hiatus... which never actually ended. BL Jacobs filled in with blog posts, concept art and sketches (along with an increasing number of rebuttals to unhappy readers) for a year or so after that. But now signs of life are weak at best: there has been the odd scatter of Twitter posts, and the site is still being advertised, but the last official site update was posted in November 2011. And the last actual story page appeared in January 2010. note BL Jacobs has gone down this road before. Talismen: Return of the Exile was an earlier webcomic of hers, with similar themes and full-page colour layout. It also suffered a similar decline, the main difference being that she did formally and officially decide to abandon it.
This has happened to Zebra Girl so often that author Joe England changed the comic's header from reading "Updated Fridays" to "Updated Unpredictably". In recent months, he has managed to publish something, if only a couple of panels, more-or-less weekly.
This happened to the creators of Claude & Monet several times for several reasons, the worst being a two-month hiatus due to their server being repeatedly hacked. After the artist burned out on a Tues/Thurs schedule, they've since moved to a Tues/Fri schedule with better results.