Thats insane! Well more publicity for Microsoft ha ha!

Heres a tip:
Overheating Solution

A rather busy XBox 360 owner has figured out a way proud owners of Microsoft's console can avoid the embarrassment and delay involved in contacting tech support for their console. In a post in the Gamespot forums, the user claims the solution should work for all consoles facing overheating problems. The solution is neither elegant nor conclusive but seems to have done the trick for quite a few X360 owners troubled by overheating related freezes.

According to Goldeneyemaster then, the problem is not the XBox console itself but the brick-like power supply. Since, by design, a large flat surface of the unit lies on the floor, the PSU tends to overheat causing the entire console to freeze. The current solution is to find a box slightly larger than the unit and to remove the cover, balancing the unit on the box edges. This way the edges of the box will provide support for the PSU while allowing all of its large surfaces to remain well ventilated. The idea is to keep as large a surface area of the PSU as possible in contact with the surrounding air, if you can accomplish this in any other way that should also work.

This solution is not risky unless the box you decide to use is not strong enough to take the wait of the power supply. If you are in any way uncertain about how to achieve this please do not try it and contact Microsoft tech support.

Source: Source