Have not checked on the Logitech forum - just discovered this today. Also have not tried coax - it's a hassle to make connections to the 975 where it's located in the rack.

I can say that I didn't have this issue when I had the Squeezebox connected via optical to a Pioneer Elite AVR a few years ago.

In addition to Squeezebox, anyone running a Sonos Connect digital out to a 975? If so, any issues with that?