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Best Answer
Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
The only thing I can think of that you haven't tried is a restart but I'm guessing that the factory reset does the same. But as it's quick to try then it's worth giving it a go:
Failing that it might be best to contact customer support to see if they can spot the problem from the server side. If they can't fix it then they can check your warranty status and advise on your options: contact.fitbit.com