I had this happen once with my Fitbit Charge tracker.
I had to do a hard reset (factory reset) of my tracker, then its Bluetooth came back to life. Here are the instructions for how to do that: help.fitbit.com/articles/en_US/Help_article/1606 . But, do this only as a last resort, since you'll lose data from your tracker, and you'll have to re-initialize your Charge tracker device with the Fitbit app on your phone....
Every now and then, I also have had wireless syncing problems in that my tracker's Bluetooth doesn't seem to be working for hours at a time. I've found that doing a soft reset (restart) of my Charge tracker each time after I recharge it seems to help to minimize how often that happens. See how to soft reset here: www.imore.com/how-restart-your-fitbit-tracker
I've also found that using a "Fitbit finder" app on my Android smartphone can test whether or not my Charge tracker is transmitting a Bluetooth signal, or not. Here's the app that I use (Bit-finder Geo): play.google.com/store/apps/details?id=com.mdvx.android.fitbitscanner . I even used it once to find my tracker, when I lost it after it fell off my wrist without my noticing. 😉
I would suggest trying the above strategies to fix your Charge tracker's Bluetooth sync problem, but in reverse order of how I listed them above....
Good luck!
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