Xbox problems! Help me please?

I was playing crysis 2 and I got to mission 3. After you go under that tunnel/ street and you defeat the ceph aliens your suppose to go into this room with a brown light flickering and begin to run up a flight of steps. As you run up the game goes dark and its SUPPOSE to show you a cut scene. When mine does dark the game doesn't come back up it just stops and I waited like 10-15 minutes. I played mission 3 again and it did the same. What can I do to fix this problem please help Thank you