My RX V-750 has served me faithfully for years. It is still a good amp and I love it and I could not afford to replace it with anything of equivalent quality anyway.

The problem is that recently it has started intermittently failing to come on. When it doesn't want to start, nothing seems to make a difference. Replugging, hammering the standby button, anything I try it just sits there dead to the world. Nothing at all happens, no light, no error, no click of the relay. 

Yet if I let it sit overnight, it starts normally. At least it has so far. All of this makes me think excess heat and failing capacitors, but there is another variable. I have been working on automating my streaming computer and have programmed a lot of different codes into my Harmony remote. A couple of times the amp has stopped working when I was testing those codes. Hence my question: Is there any kind of diagnostic or technical IR code that anyone knows of that could put the amp to sleep? I'm not talking about the normal power off toggle, but something that sends it into a coma. I'm just trying to narrow down the possibilities before I go to the considerable trouble of disconnecting everything and taking it to a repair shop. I don't want to pay a technician to tell me there is nothing wrong with it. I need to be as sure as I can that the IR codes I am playing with cannot be affecting it in any way.