Has any Xbox 360 owners suffered from the power supply light turning red?

The first time I noticed this happen, I had to send both the Xbox 360 and the power supply to Microsoft. A month later, I got my Xbox 360 back...but not the power supply. When we called Microsoft, they claimed that we "accidentally sent our power supply" even though they specifically told us to. Anyhoo, a week or two later, the power supply came back and the problem continued.

However, I discovered that by plugging in the power supply to different places ports in my home and by taking off my intercooler from my Xbox 360, the light would turn yellow again. From time to time while my Xbox 360 is off, the red light will appear. I just try plugging it in to different places and eventually, it works again. It's kinda weird.

Has anyone else had this sort of problem?