I have exactly this problem. No real logic, goes a few weeks fine then I try and use the stopwatch and it turns off or go for a run and it turns off. Even happens from time to time in the night, which means you always need a back up alarm. I am on my third Iconic, first just turned off and never came back on, second, kept failing to sync and this one is just unpredictable. Response from Fitbit support less than impressive (basically, we know it doesn't work, we don't know how to fix it, revert to all the manual ways you used to do things before you invested in a £200 watch!:
Thanks for letting us know about this exercise issue.
We’re aware of it, but may not be able to provide a fix in the immediate future. We'll continue to monitor the situation, and keep our team informed of the impact to you and other customers. We understand that this isn't the resolution you're hoping for, but rest assured we're always working to improve our products.
We suggest you to manually log the exercise on your Fitbit app. To have more information you can check How do I manually log exercises in the Fitbit app?
We apologize for all the inconveniences. We appreciate your patience and look forward to getting you back on track.
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