The only way that I can connect is by putting in my ip address that I know works. Then test connection. It logs in saying that I am connected to xbox live. I then start game play on black ops(or any online game), sign in, find a match and begin playing. Within 5 minutes of playing I get a connection error message and I am dropped from the room. Then within another minute I am logged out of xbox live. Try to log back in and says I can't connect to blackops server and will have to go through the whole process again. I have no problem with my other xbox, just this one. It is a MW2 special edition if that makes a difference.