Disk Read Errors for 360

[IlliniLou]

I saw a similar thread but that was about the discs actually having markings on them. I just got the 360 and with brand new games and dont leave them in the console or move the console when its on. there are no scratches at all on them, but usually if i've been playing for about 2 hours, then the system stops the commentary for whatever game it is and says theres a disc reading error. Is my system just overheating? Do I need to buy some sort of fan or something? Any help is appreciated