Im gonna tell you my story:
We get (brothers and i) the ring of death, we send it to microsoft, then CoD4 stops working, missions wont play. Again the lence (the thing that reads the discs) wont work. Oh ****, the only ****ing remedy is to buy a new one, so far no problems.
And with PS3 i have low FPS with CoD4, i dont know why, but i just get them.