I'm 48% through the campaign and haven't had any problems. I come home from school today and my game isn't going past the loading screen..wtf? It's just sitting there saying it's loading the map. I restarted my xbox several times to no avail. Any idea what's going on?

I had the same thing today (although it years since I was in school)......

Had to restart the level.

Dunno what's happened but its ok now.