What do you do with a Fitbit that suddenly turns off?
Fitbit customer service
Sometimes, you can solve a problem with your Fitbit yourself with a reset. Did you reset your Fitbit and does it still not work? Or does your Fitbit display a black screen? Contact the Fitbit customer service. They'll help you further to solve the problem.
Reset your Fitbit
If your Fitbit won't turn on or keeps crashing, you probably can't access the settings on your Fitbit anymore. The only thing you can do is to reset your Fitbit. How this works differs per Fitbit. In the article below, you can read how to reset your crashed Fitbit.