RS 520 Drop Out While playing CD via Coax

I have a CD-Transport on Coax Line in. When playing Music via CDT via Coax in, the Sound Drops/Mute every 30 to 60 seconds for 1 or 2 seconds. Very annoying …. What to do?

I would start by trying connecting with a cheap toslink cable or a different coax cable. Probably not that simple a problem but worth a try.

Long Story Short: it‘s the cable. 🫣 Sorry for posting.