I purchased BF3 on release and installed it to my hard drive. I have played mp, co-op and sp since with only about 4 times my xbox midgame would say unable to read disk and dashboard me. I have been trying to play the co-op recently and on the last mission after you exit the subway and enter the bank my xbox says unable to read disk, everytime. I have tried everything I can think of including deleting and reinstalling, clearing cache and even getting as new disk. Any ideas??