My SR5007 started shutting off on its own recently. I've had it for 2 years and never had any problems. It didn't seem to be getting hot. The first few times that it shut off, I was able to turn it back on, and it would work for a while before it would shut off again. Now, when it shuts off, the red standby light flashes. I read that this could be caused by loose speaker wires touching the wrong post, and when I checked, I found one of the wires on my right front tower had come out. I fixed it, but still had the same problem. Then I read about reseting the receiver, I tried that, and I still have the same problem. Any ideas on what could be causing this?