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There's an episode of Seven Days where Frank gets stuck in a "Groundhog Day" Loop due to some kind of problem with the time sphere and the head of the tech team tries to fix it each loop but it never works. The final time they think they've figured out the problem, but what with one thing and another Olga, another team member, gets killed in that iteration so Frank makes the tech stop the fix, so he can go back one more time to save Olga.

I don't know when it aired but what was the name of the time travel show where the main characters refused to let someone fix the malfunctioning timemache and instead go after the criminals immediately despite the whole time travel thing?