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check your wires if there not touching behind the speakers and receiver. when it says protect this means something is shorting out or crossing over. one other thing it may be is if a speaker is starting to go bad. (please rate)
To answer your question;
First i`d like to know if there is a specific message on the front panel display before it shuts down.
One thing you can try at this time is to switch back and forth a couple of times the impedance selector switch at the back.
Another thing is to try to loosen up and re-tight all the screws at the back of the receiver(you`ll need a philips/star screwdriver) as the back panel is often used as ground for different circuits.
Try that and let me know about display messages.
I`ll be waiting for your answer
If the wires got crossed and/or touched each other at all - that could certainly damage the amp(s).
Also - if the system is not made for extra speaker - that would change the ohmage - and that could aslo damage the amp(s)..
Or maybe the system designed to protect the amp(s) was damaged..
You may reset the unit to factory setting. Hold buttons "Speaker" and "SpeakerB"and turn on power switch. Release buttons after 5 seconds. You will loose all your setting and need to do configuration again.
I would check your wireing in the system end and just make sure nothing has loosened up over time this can happen even if you don't move the system. The only other thing I can think it maybe is the system is overheating and shutting down. When it does it again carefully feel around the system particularly the rear of the system if it is really hot it is probably shutting down. Is the cooling fan runnig?
You should first chech out all the speaker wires, the connections on back of the reciver, and on the speakers and make sure there are no little strands touching. If all thats good , disconnect all the speakers and see if the reciver still shuts down. If it does not, then there is a problem with the wiring or the speakers. If it does still shut down, im sorry to say that the move must have joggled something and there is a problem in the unit. Unfortantly, these are solid state units and have no user replaceable parts inside. It may not be worth repair due to the high cost these days for labor, but for sure see how much an estimate would be first. Good Luck
Ps Please dont forget to rate this thread