it would appear that you have a overheating problem and the amp is shutting down. If you have added extra speakers, the impedance may be to low. Try a fan blowing into the amp. But first make sure you have not got incorrect speaker impedances
That sounds like a fault FET or power transistor, or a cold solder. When the volume is raised the voltage is send higher current/voltage to the base, there-by activation the transistor. I have the same issue as well, but was able to correct it.
Since it is indeed in the power section the heating makes the solder joint contract, cooling would make it expand, making the solder joint loose loosing contact when the unit heats up.
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Check your speaker connections at the back of the receiver and at the speakers. You have a short. If you don't see anything obvious, disconnect your speakers at the receiver and play a dvd and turn up the volume. If it stays on, you have a wire or a speaker problem. If it cuts out , you have a DSP chip problem. Reconnect speakers one by one and test each speaker until it cuts off or you have fixed the problem. If you still have issues, post a comment and I can help you some more.
This is a power overload protection circuit, to prevent you from blowing out your speakers. It's measuring the amperage through the circuit; I suspect you have a short-circuit in your speaker cables (do you have pets?).
To check, disconnect all speakers, then add one at a time until the problems appears. When it does, that's the speaker wire to check.