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In the hope that it's just a software glitch I would try restarting it by:
If that doesn't help then, as you say, it's probably defective and you should contact customer support via contact.fitbit.com If they can't fix it, they can check your warranty status and advise on your options.
Best AnswerI tried all methods mentioned on forums and none of them work for me. I guess I have to contact their customer support for help then.
Best Answer