Uniti Qute 2 channel issue

I’ve just put a Uniti Qute 2 into my system for streaming duty and it keeps dropping a channel. Not fully, it just has R channel quieter than the other. If I turn it off and back on it sometimes returns.

I’ve tried all sources and it is the same. When I use headphones the sound is fine.

I am using the preamp output into my Denon PMA850 which tests fine on all other sources.

I’m stumped.