My Vivoactive 3 Music (updated, with version 6.0) no longer maintains a connection to the Garmin Connect app on Android -- in my case version 4.3.9 running on a Google Pixel 3 running Android 11.
I can un-pair and re-pair, and that works, briefly. I completely reset the watch to factory default and deleted all of the Connect app's data and then paired again, and that briefly works too. Then the connection drops again.
I chatted with support, connected the Vivoactive to my Mac and used Android File Transfer to delete the Activity, Monitor, NewFiles, RemoteSW, and Settings folders (I don't see how that does more than resetting to factory default). Then I removed the device from the Connect app (again) and re-paired (again) and it synced, briefly (again).
Within about 10 minutes the connection to the Connect app was lost, although the Vivoactive remained connected to my Android phone.
I'm out of ideas and so (apparently) are Garmin support reps -- two of them abruptly “exited the session” after running through initial troubleshooting steps -- any one having similar experiences and have any ideas?
I recorded a video where you can see the watch successfully connecting, disconnecting, and connecting to the phone, just as you'd expect it to do. HOWEVER, when connected to the phone the Connect app still says the watch is disconnected: https://youtu.be/5IDHj8-OPrU