Assman plays matches in network game.

My friend and I are playing FM11 over a Hamachi network (after not being able to open the correct ports for FM11's networking service to work). The game plays fine until it comes to match day. At that point whoever isn't hosting the game gets kicked and their assman plays the match for them. I have a rubbish internet connection (about 2-3mb) and we're both playing on semi decent machines, both easily ran the game on their own. We've swapped who is the server but the same thing happens.

Why do you think it is dropping the connection, is it likely to be the internet bandwidth available?

Thanks in advance.