Hello all, I have a three-year-old Harman Kardon AVR 430 that occasionally turns off on it's own. When I go to push the on/off switch afterwards, it makes the normal clicking sound as if it powering on, but then it doesn't actually power on. Then when I try it again a few minutes later, it powers on. All of my other electronics are plugged into the same outlet and they work normally when this is occurring. In addition, a few months ago, the receiver's volume had an erratic episode where the volume jumped from -45dbls to -5dbls, and the advice I got was that it was just a temporary software glitch. I would greatly appreciate your advice on what this might be. Is the sudden power off possibly a firmware glitch too? Should I try reinstalling the firmware? Or is this possibly a hardware issue and are the volume and power problems related? Thanks a million!