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Protection mode can be triggered by a any number of things:
a short as Girish said
overheating
trying to drive speakers with too low of an impedance
running out of either voltage or current like during demanding bass passages
Protection mode is like an internal circuit breaker inside your unit and it will be activated if it senses something is wrong with your electrical supply, sound output, or sound input. It's your receivers way of attempting to protect itself and often it takes a little bit of time before everything is back to normal, provided you haven't damaged it.
Maybe one of you can break down and get new cables.
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