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When you tried the restart procedure was it on the charger as described here?
https://help.fitbit.com/articles/en_US/Help_article/1186/
If so, then it may be worth trying it a few more times as the procedure doesn't always work.
If that doesn't fix it then you can contact customer support via this link:
As you will still be within warranty, if they can't fix it they usually replace it.
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