It was bad on my fourth gen and is worse on my new 4k. I am at least glad to know that others have this issue, only in so much that it's not my equipment, but perhaps some settings, or just that Apple doesn't know WTF they are doing anymore. That company is getting so sloppy. Im almost wishing I never went down the path with them. Fat, lazy and stupid is no way to go through life...
I will come back and document my setup, and see if I can figure out anything in the meantime. One poster upthread mentioned some setting changes with video detection that worked to fix it for him/her. Crossing fingers I can find an easy fix. For now, I change apps, channels with the mute on as this noise cannot be good for my speakers and they are a major investment I don't need Apple ***** up.