So, I notice that my receiver (speakers) is on. Pretty sure I turned it off, last night.
Press power button; still on. Find remote, press power button; Still on.
Unplug from wall. Plug back in. Press power button.
Open instance in the spirit of netizenship. Cyberpunk leaning, tech-forward, available to the public; I provide a lot of services that no one but me really uses, just 'cause. https://drastical.net/
So, the receiver is dead.
The slightly interesting part of this is, I have a PINE64 with an i2c temp/humidity sensor, being monitored/logged over SNMP. The temp sensor is sitting on the receiver and you can easily correlate when the receiver is on or off by the readings.
Well, you can pretty much see when things started to go haywire.
(don't mind the bumpiness toward the right, the older data is averaged.)