Judging by these forums a LOT of people are having issues with their devices losing sync with the phone, getting "Bluetooth Connectivity issues" errors and not receiving notifications. I too have had massive issues, spent a lot of time with Fitbit's very helpful support staff and even eventually had my Charge3 replaced.
However, even replacing the device didn't solve the issue, and I now suspect that culprit lies in the Fitbit app itself. The reason for this conclusion is that while researching this issue, I came across mention of an app in the Play Store called Sync Fix for Fitbit and Huawei/Honor Phones. Even though I had a different model phone (Asus Zenfone3) I decided to try the free trial period and this app has single-handedly solved ALL of my Fitbit connectivity issues!
Data syncs regularly, when I prompt it to, notifications come through reliably, basically my Charge 3 now works as it should.
As the app developer points out, there's no guarantee this will work with all phones, but as it's free to try out (and only $6 for the full version) it's certainly worth a try.
To be honest, I don't love the idea that I need a 3rd party fix for this, nor that I have to shell out more money to get this thing working right especially when the very existence of this app proves that the issue is a software one, and one that a single developer was able to track down and fix for a large number of devices. That said, if it works, I'm willing to compensate clever people making my life easier. 😛
Fitbit, consider getting this guy on payroll maybe? He seems to know his stuff. Good luck, everyone!
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