I'm struggling to fix this. I have a background in IT so trust me when I say I have tried everything.
Someday last week my Vivoactive 4 stopped synchronizing with my iPhone XR iOS 15.1. After a couple of hours of rebooting, trying to pair again, etc I factory reset the watch.
After reset I was able to maintain connection for 60 seconds and it got disconnected. I did not move the phone, did not leave Garmin Connect App, anything. I tried for several hours to regain connection but still nothing.
Deleted app, reinstalled, nothing. In the end, I factory reset again the watch to be able to link the phone and watch for only 40-60 seconds. After that the watch goes again into a "disconnected mode".
Watch does not appear as connected in the iOS settings app. Sometimes it appears as "Misc".
Has anyone experienced this? I tried with SW 6.40 and Beta SW 6.42. Same thing.