This just happened to me, for the second time. The first time, I assumed that I just made a mistake and didn't hit submit or something like that, but this time I'm sure I did. Exactly as you described, I made my move, hit submit, everything looked normal. A couple of hours later, I lose on time.
Android app not making my moves.
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This morning I got the "you have 8 hours to make a move or you'll lose on time" message, so I logged on to chess.com from the latest version of the Android app and made a move in a game I was completely winning. I hit "submit" and everything looked normal and showed that I had made a move, only it didn't. I lost on time.
Is anyone else having this problem?