Hey, i saw this thread and i was like...hardluck for that guy. Anyway this exact problem happened to me about 2 months ago, its tovdo with some routers and modems, at first they work like a beaut but then then go crazy. Unfortunatley your going to have to get a new modem/router or you could email activision about it or go to, You must login or register to view this content. and check if the port for Mw2 is open, if its shut you need to call your internet supplier and ask them to open it. (can't remember what it is at the moment). Good luck though