Quote: Could be LED lights, FLO lights, WIFI ROUTERS, MODEMS, BRIDGES, or some other appliance that runs at night
This can be a bigger issue than people realize. Especially if you're running digital music over WiFi.
Funny thing - I had a "customer" (just a friend of a friend who offered me a few bucks to help with their home audio) who was having lots of issues with his system. It sounded great most of the time, then would just go to hell randomly and he couldn't figure it out. And what's worse, it didn't fail or break in any way, it would just get..."itchy" or sound off.
Turns out he had these old school dimmers throughout the house that were putting lots of noise into his electrical system. Hell, some of them I could hear these transformers humming from across the room (oddly enough, neither he nor anyone in his family could).
Add to that, his wifi would drop whenever someone used the microwave, because his wifi router was just in the room on the other side of the kitchen. I had him swap out his dimmer switches with more modern ones and move his router to a different room and all his issues were cleaned up!
These days it's helpful to be an audiophile nerd and IT guy at the same time.