MAC6700 issues again

[miner]

Last March 2017 I had to send my MAC6700 in for service - software was corrupted. I was not able to power the unit on. Yesterday I was not able to power it down. I reached for the remote to turn it off but no response when using the remote, was not able to switch inputs with remote either. I can change inputs from the input knob on the front panel. Volume control works, too. Just not able to turn off. The unit will power off on its own after 30 minutes. Frustrating to say the least. There is a service center 23 miles away but the weight of unit is enough to cause an issue for me. I have to say this one piece has given me more issues than any other Mc piece I own. I am not able to reset microprocessors since unit won’t shut down while depressing the Standby red button. Any other owners experience similar gremlins?

I have whole-house surge protection at the box and MAC is plugged into an APC20S.