I have had the exact same issues with it. It freezes up at completely random times. I have done the clear of the cache, installed the game, got a new disc and yesterday I went and bought a new xbox. Brand new slim, vs my old 1st gen, figured that would help the problem but it didnt. Now I have only played online co-op, and it only seems to happen when I am the person joining the game. So does anyone know why this happens or how to fix it ?