I was playing the co-op campaign with a friend. on the first heavensong mission. I moved an archer from his initial position next to a barracks and was immediately booted from the game. I was given an error that mentioned something about an issue with the server. When i tried to get back into the game, I had no trouble up to the point where it handed over control the game immediately booted me and gave me the above error. Not sure what computer specs you need. I have win7.