Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
It's basically a problem with the phone communicating via bluetooth with the fitbit.
I would try restarting your phone and then restarting your fitbit using this procedure:
Give this a few tries as it doesn't always work. If it still won't sync after that then there are some more ideas to try in this help file: https://help.fitbit.com/articles/en_US/Help_article/1866/
Best AnswerIf I reboot or shut down my fitbit versa will it lose my data that I have not yet synced?
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Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
@SunsetRunner a restart or shutdown is safe. Fitbit say:
"Restarting your device turns it off and on without deleting any activity data."
taken from Help article: How do I restart my tracker?
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