I have a problem. Before, i can play CoD world at war xbox live in cooperative matches and multiplayer matches. However, recently, when i log in, i cannot play any cooperative matches such as the competitive co-op, campaign co-op and Nazi zombies but i can play the multiplayer game mode. can anyone help me with this? I dont think is gt to do with the connection since i manage to log in into my xbox live but no into CoD World at war cooperative matches.