server problem?

[InfiniteStates]

It's probably your connection if it's games that you are hosting. Similarly, it could say "connection to host lost" if you have joined someone else's game. The likelyhood of all players losing connection at the same time while your connection is fine is slim to none.

Make sure you have the appropriate ports open in your firewall, or even better, put your console in a DMZ. The game goes peer-to-peer for the game play, so the host is the server.