Starting yesterday the game started crashing infrequently, and every time it crashed it couldn't sync achievements nor save to cloud. I disabled save to cloud and it helped a little but the crashes have gotten more and more frequent and now I can't play more than 5 minutes at a time.
It seems the game is exiting every time it loses connection to Ubisoft services, which is a bit nuts considering it's a single player game (that has already been cracked) and is absolutely ruining the game. Nothing on my end - everything up to date, temps are fine, game is on an M.2, even my antivirus is disabled. My system specs are fine, the game isn't putting anything under full load (well my graphics card, but it's also maxing out at 75c, well within limits). It crashes and then complains about Ubisoft sync so it looks to be that. This is really poor service.