same here, it only does it with gears of war. i did all the steps M$ has to try to fix the problem, like delete my saved game files, (luckly i have an extra hardrive). but to no avail, the 360's are junk, plain and simple, and M$ service is lousy, i spent an hour on the phone with three different people arguing for them to send me a box. they wanted me to pay to ship it out. they finally caved and sent me a box, i'm going to send it out today. i'm also on my third copy of gears of war. i work at sears and we get back 1-2 360's that dont work. these systems are so bad, but i have one and cant return it so im stuck with this giant white paper weight. and if anyone on this site thinks the 360 is a reliable should really go see a doctor to check if they have downsyndrome. seriously i hate fanboys, especially for and unreliable load of crap that the 360 is.

my 360 reads everything fine. so do a lot of other peoples. you just happen to be one of the unlucky people who happens to bitch and moan about it. I hope your problem gets solved.