My NCAA locked up on me and I had to delete the saved files to get it to load properly. I have seen where people have had the same problem with several other games. And deleting the saved files seemed to fix the problem in most cases. I wonder if Microsoft is aware of this?? I wonder what the possible causes are? My XBOX worked perfect for 6 months. Hopefully It won't happen again, but it will be in the back of my mind.