My xbox 360 flashes 2 red rings within 20 minutes of any gameplay, except as an arcade game. Although I have watched literally seasons of tv shows through my xbox 360 without it overheating, so basically the problem only comes from playing games. Yes it is in a ventilated area. Although I am going to try to install a game onto my xbox 360 and see if it freezes when I play it through the xbox.
Any help would be good.