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Note the link to the service manual. I did not go all there way through it, but might be work looking at to see if they offer any suggestions. Good luck.

I would have to agree, this sounds like a power issue, which would easily point to a bad power supply, regulator, or blown out caps. If the button was stuck or making momentary contact on its own, it would turn itself on as well as off, and you are not seeing that behavior. I would open it up...