Today I needed to change the time by going one hour back (for example 12:00 yesterday is 11:00) today.
Before I changed it, the accuracy was exemplary, about +2.5 sec per day. Now after the change it went back 5 seconds in HALF AN HOUR! Several minutes since the morning!
What's going on!?
Edit: I've set it well out of the danger zone, so that can't be the reason.