Strangest HiFi Issue I've Ever Seen

[ssh]

And the bathroom's supplied by the main panel?

 

Try disconnecting the wiring at the fan and operating the switch, if there is still a problem, replace the switch. If the problem goes away replace the fan or install a surge suppressor.

 

I was once a member of the IBEW but I am not an electrician.

[ssh]

Can you power your audio side with a portable generator?