Yamaha Cinema DSP Natural Sound System AV Receiver #RX-V459 was installed in 2005. It has never worked correctly. It sets on an open entertainment center. It has space all around, 2"on top and nothing on the sides. We have taken it into Radio Shack and they say it works fine. It will work for 10-30 seconds and it shuts off. Yamaha Cinema DSP (Natural Sound AV Receiver #RX -V459 Any suggestions on how to fix this frustration?

Are you saying the unit dies in 30 seconds at home but it works fine at Radio Shack?

Maybe you need to assess your power sourcing or any other condition that's unique.

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Eure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.