That tempts me to RMA - thanks.

Yep - they will not copy back to the main drive either (content blocked or something like that).

I have noticed that it gets better (to some extent when you manually change the gpu to 200). It perhaps does not bode well, because it may well then be interference from whatever the GPU is doing - you cannot fix that by just throttling the GPU. I guess the solution is bluetooth earphones, it is annoying given many of us have upgraded from the lcd.

I think it has to be hardware, as I get the issue from my windows pc (basically poor shielding between the electrical gubbins and the jacks). Navigating the menus makes the sound change.