Every few days my Forerunner 55 stops synchronizing. In Android App the watch looks like turned off. I had to drop the device and add again to work for more days.
Started seeing the same with a VivoActive 3 and a Pixel 7a. Had been working fine for months, but after a recent Connect App update, a few weeks ago, I have to re-pair watch every day or two.
The strange think is that I also have an Edge 830 paired to the same phone and it has never lost the pairing
My VivoActive3 has stayed paired for a week now (after pairing via the Android dialog and not via Garmin Connect App).
The last update I had to the Garmin Connect was on the 1st Aug, so I doubt that has caused a fix as I saw the issue after that. My phone has had no OS updated for a month or so.
I will keep monitoring, but this far mine seems to retain it pairing
Recently I've started seeing this too my Pixel 7a. Both my Forerunner 245 and Vivosmart 4 periodically drop their connection. The Vivosmart 4 drops much more often. Turning bluetooth off/on fixes the problem, although sometimes I have to do that several times. Restarting the phone also works.