I also have this issue with loading 4:2. Thought it might be due to the disc getting scratched as I was playing on my brothers shitty old 360 so I toothpasted it but to no avail unlike my GTA IV. Incredibly annoying problem.
100% Retail: CoD 2, Hitman:Blood Money, Bully, Just Cause, Assassins Creed, Gun, CoD 4, Oblivion (1250), Bourne Conspiracy, OFDR, Fallout 3 (1550), Halo 3:ODST, Godfather (1250), Godfather II, Qauntum of Solace, MW2,Assassins Creed 2, Viking, Fable II (1350), Borderlands (1250), The Saboteur, Lego Batman, Batman:AA, Bioshock (1100).
100% Arcade: Battlefield 1943, Zombie Apocolypse.