Title says it all. Some titles work like gems, others don't. It is really weird--I've cleaned the XBOX and my discs are in great shape. A game will work one time and then not the next. I had ESPN NHL2k and it worked for awhile and never did again. I returned it twice more and the same thing happened. Now the same problem with Buffy: Chaos Bleeds which used to work fine, and with ESPN basketball--yet football and baseball work fine. I don't get it? Anyone?