Denon AVR-1709 intermittent protect

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This unit goes into protect intermittently. With no signal or load. Heating and cooling, flexing PCB's etc. will not make it fail. When it works it is fine, no noise or pops. After going into protect I can turn it back on and it will work. No DC offset on output transistors. Power supply voltages check OK. Has anyone seen one like this before?

Thanks, Mike
 
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