Halo 4 campaign won't load??

Hey guys. About a week ago I ran into a problem. I had just finished Shutdown and the campaign stopped. Brought me back to the mission menu and when I tried to choose Composer it said that it had failed to load, so i thought, maybe the disc has a scratch, yet there was no scratches. So then I decided to play all of the other levels (that I had already completed with no problem) on legendary, but then it wouldn’t let me play any of them!. I can play Spartan Ops and Matchmaking just fine, but there’s 0 functionality on campaign. can anybody help? I don’t know how to contact 343 directly and I really… REALLY want to finish this game.

Try to reload disc 2

Well I’m having the same problem but except it only will not let me play midnight so I am just that step away from unlocking the master chief armour and it makes me mad that I can’t get it.

> 2533274985770564;3:
> Well I’m having the same problem but except it only will not let me play midnight so I am just that step away from unlocking the master chief armour and it makes me mad that I can’t get it.

Maybe your disc is broken or scratched?