COD/MW2 THE SKY IS PLAID HELP!!!

Hello, having problems with call of duty: modern warfare 2.
So for the last two days while playing either xbox live (multiplayer) or missions (not live) the sky is striped and any flat surfice like a wall has really shitty graphics and texture issues...there are no graphics issues at the menu of the game or during any other portion of the game up until game play begins and it continues throughout gameplay.
I play on an xbox360 and I am not having issues with any other games, I have an HDTV and do not have any issues watching HD programming! AARRRRGGGGGG!
Help.