This issue has occurred twice for me now. Basically what happens is that during gameplay, the music will cease playing, all dialogue is absent, and the remaining sound effects are altered and quite odd. After this occurs and the mission is finished, the game will get caught in the loading screen before the end-game XP award screen, and eventually, an error message will pop up saying the disc is unreadable. This has only ever occurred to me in Spartan Ops.
Is this a common issue? If so, can anyone give me any advice on a possible solution or a way to avoid this? My game is installed, by the way.