Forerunner 965 blocked during saving run session

Hi all, when I save the run session, a circle red appears, the saving procedure is blocked and I'm forced to connect the watch to pc to unlock the watch.

Otherwise, after minutes the autosaving procedure works successful.

Garmin support suggest a master reset but did not help.

Current software version is 20.29 DFU-6842d1

It seems that this problem occurred after updating firmware to the last version

Right now I tried to delete all saved session in the watch hoping for the best.