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The usual things to try when you get syncing issues are:
Note that fitbits have a limited amount of storage to hold data between syncs. The Charge 2 can hold up to 7 days of detailed data. After that it starts to hold data at a daily summary level and can do that for up to 30 days before it starts deleting information. So, once you get your syncing issues sorted, your data may look a little strange.
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