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First thing to try when a fitbit misbehaves is a restart using the following procedure:
It does no harm and can sort out all sorts of issues. You might need to give it a few tries though as it's known to not always work. If it doesn't work then contacting customer support is your best option. The contacts for India are at https://help.fitbit.com/?l=en_US&cu=1&fs=ContactUs&co=IN
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