I took,Altas, suggestion and went further with it. Since we know that the H20/600 has air vents on the top and bottom,that, I figured, that with the receiver sitting on anything, that it wasn't getting enough air flow. So, what I did, which is very simple, was put a block on each underside, of the receiver, a 1" X 2" X 9 3/8", and raise up the receiver so, that it was getting a better air flow. I believe this will stop the overheating problem, which I know, in my case it has. I hope this helps anyone, with a similar problem. Enjoy Ya'll:up