I have a HD Radeon 6870 and for a little while now I have had some issues with my graphics freezing up and the sounds gets all distorted for a couple seconds. If I play a ten minute match of CoD MW3 this could happen at least 5 times. Sometimes it won't do it at all if I restart my computer or haven't had it on for a while. It even does this during movies and other games I play but it's most frustrating in CoD due to the fast pace of the game. Let me know if you need any other info to help solve this issue.