Yep, unfortunately, four of my friends and I are still getting this issue that happened every time in beta 1. I'm in the process of sending Ironclad all our save games. Hopefully this will help them track this down. Currently we can only make it an hour or so before the desync eventually happens.

And that really stinks since we all love to play cooperatively against the AI. Not blaming Ironclad because, well, its a beta, so things are bound to have problems, but I really do hope they get this fixed soon so we can make it through a whole multiplayer session again.