Hi there @SunsetRunner. Great to see you in the Forums.
That sounds very strange... Have you tried besides restarting your tracker, setting it up as a new device? If not, after restarting it, go to the Account section at the top right corner on the Fitbit app and select the option that says "Set up a new device". Follow the on-screen instructions and once you're done, your tracker should be syncing without a problem.
It would be worth also restarting your iPhone and see if that makes any difference. Let me know if you need more help with this!
Ferdin | Community Moderator,
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