I bought gta v from zavvi and it worked perfectly fine but since the new title update i have occasonally been getting this message: "the disk is unreadable" when i try to play the game. Today, I can't even play the game at all. I tried several times to wipe it with a soft cloth, no change. The disk is not scratched and looks brand new and was working perfectly fine yesterday. I have an xbox 360 slim 250gb. PLEASE help.