The first time it happened we didn't understand that the game went out sync and my brother ran another instance of the game, just at the end we realised we were not at the same game for a while, because we were playing at the same time against the AI. But I will try that if it happens again.
Another importante thing for me is that here where I'am, when I'm playing at my PC that has a much better graphic card, it is not rare to have a short power loss. And as I have a public IP address usually I'm the host for the match and if there is a power loss we lose the match. It happened twice last week and that was frustrating.