So i start a game with just me, my friend, and an AI. It goes fine for about 5 minutes and then the game frezes for 5 seconds, and then it says he left the game, but when i talk to him he says the same thing happened to him but for me. Any solutions?

One of you guys lagged out -> your internet connection either restarted or was down for a short time.
There's no fix really... it just happens ><.