I thought it was a problem with xbox live in general, not cod 4. Because up until a week ago when xbl started going down cod 4 was just fine

Funny.......yeah I have the exact same problem. It used to happen to me all the time in golden eye and basically no other game. I didnt have the problem again for the longest time until I played the Darkness a few weeks ago. A couple of minutes of that game and I feel straight sick.