I'm trying to join in an online multiplayer game of Dead Island and I can't get connected with my friend. Both of us are connected to Live, and he is currently in the game with another friend of his, but when we try to connect it says that the connection failed. This isn't the first time it's happened, but the last time we managed to finally get connected after a few tries. When I accept his game invite, it will start to connect and give me a loading screen where it is trying to connect, and I can even hear him talking to me over his headset, but then the moment the loading screen goes away, it gives me a message saying that I couldn't establish a connection with him. We are on the same network, so why are we having such a hard time connecting to each other?