So far 14.20 has been positive for me with the battery. Doing spot checks shows it back to .3 percent per hour and staying consistent.
garmin express > fenix 5 > tolls & content > utilites > uncheck auto-update apps.
on watch go to settings > system > software update > off
but when connet watch to PC he always download new software and need to enter in \GARMIN folder of the device and delete gupdate.gcd and also can check folder \GARMIN\SCHEDULE for gupdate.gcd and delete him or watch will new software version