My Garmin 965 only syncs with the connect in activity, time out of sync

From the last software updates my Garmin 965 stopped sync with connect, only when I go into activity, it syncs. 

When not synced, the time starts to drift very fast (a minute in few hours). 

Also, connectivity with ANT+ sensors is unstable. 

All of those were not in previous versions. 

I tried all possible options: Hard Reset, soft reset, install, uninstall, BT forget, nothing helps. 

I would like to roll back to version 18.XX to check if its software issue or hardware, but I cannot find a version (GCD)

If someone can share or have other ideas, please let me know.