Something wrong was with time.windows.com server. I found that one of my computers set to 1 hour ahead since yesterday.
Just set computer time and restart wallet, soon all start working.
Hmm, I didn't see this on any of my computers. You said max time drift is 3 min, so wouldn't this limit prevent any times 1 hour into the future? Also, the time is UTC so even if time is ahead one hour, UTC time should still be correct regardless of what Windows tells you is the time.
Something buggy, no?