I am experiencing the same issue. Today I had joined my first ever playable game. But before I'd had two turns it froze again. No recovery. Wish I knew why.
EDIT: Is no one going to address this at all? It would be nice to at least be told that my problem was simply too uncommon for concern.
Or maybe just to be told that it's now under consideration. My system is a Windows XP system, by the way. I have ISDN internet (if you are even familiar with it; a bit like "super dial-up," but more than adequate for many online endeavors -- including this one apart from the freezes). This game runs smoothly for several seconds, I'd say anywhere from 30 seconds to 2 minutes. During this time I experience a smooth connection. After this, I am struck with horrible lag or frozen beyond recovery. It's painfully annoying because I really enjoy what I've been able to play of this game so far.
I play popular games like Call of Duty: World at War and Borderlands 2 with a ping of anywhere from 70-170, so please do not simply tell me my internet is at fault. There shouldn't be much to keep track of between players, so I'm a bit vexed. I do notice that the problem escalates exponentially when more players join. Two players may last a good while, maybe even 10 minutes. Three players becomes the usual 20 seconds to a minute. I've never been able to play with four players.