Hi there @fitness01, good to see you are visiting the Fitbit Community! I saw your Flex 2 is not stay connected. I'm sorry for the late response, but I'm wondering how it goes? Is the issue still persisting?
I would recommend to update the Fitbit app to its newest version. For more detail refer to this post, this wold improve the stability of the Fitbit app at the moment to operate with your phone.
If the issue continue, give it a try to these suggestions: Why won't my Fitbit device sync?
See you later and hope this helps.
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