360 Games Keep on freezing.

I'm not sure if its the crappy 360 hardware or EA. My Madden 08 and NHL 08 keep freezing or i get the dirty disc error right in middle of game. I got NHL few days ago its in perfect shape yet i got this 3 times already. Frustrating cause i'm a big hockey fan. Madden actually got scratched. I have yet to get this problem with 2k or Other games. I'm trying to figure out if its the system, which i now hhave sitting on a stand in the middle of my room completely open and vented on every side with a fan on it(which is sad enough that i have to play something like that).

I've sent mine in for repair three times now, and two of those three times, the red rings were preceded by dirty disc errors.

I'm sure not a hardware guru, but I would say it's 99.9% probable that it has absolutely zilch to do with the disc in the machine, but rather, the machine itself. Just wait for it to red ring and then send it in to Microsoft.