Bluetooth synching with Fitbit

I have a Moto G4 and a Fitbit one. It says can't find tracker. If I restart phone it will work once. If I keep Bluetooth on constantly it will work. If I clear Bluetooth data and restart phone it will work for a while. I have put phone into recovery and wiped cache works for a little while. If I go into Bluetooth share and clear data and cache it will work for a little while. It worked perfectly when I first got the Fitbit from July until about 2 weeks ago. I have tried uninstalling and reinstalling the software, and have also reset my Fitbit. I have also opened phone in recovery mode and wiped the cache. My partner has same phone and Fitbit and is also experiencing the same issue. Any ideas for a permanent solution.

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