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Please try restarting your One by doing the following:
Plug your charging cable into your computer.
Plug your Fitbit One tracker into the charging cable, making sure that the gold contacts on your tracker align with the gold contacts in the inside of the charger.
Hold down your tracker's button for 10-12 seconds.
Remove your tracker from the charging cable and press its button until the screen turns on.
After that, please keep an eye to your tracker's behavior and post back with the results!