I have the exact same issue with Halo 4, Mission 8: Composer. After reaching the first checkpoint, I saved and quit the game. I came back a few hours later and attempted to resume the campaign. It opens the loading screen, plays the music and the loading bar starts to fill. At about 80% full, the loading bar seems to jump immediately to approximately 90%, the music immediately freezes and continuously plays whatever note was playing at the time the game locked up. After approximately 10 seconds, the entire Halo: The Master Chief Collection game crashes and returns to the Xbox One home screen. Restarting the game has the same effect. Restarting the console and the game has the same effect. Unplugging the console, letting it sit for several minutes, plugging it back in, booting the console and testing the game has the same effect. Beyond completely reloading the game and patches, not sure what else I can test. Hope this helps.