Man, I'm getting weird results with this damned thing. I hooked up an ODROID via Wi-Fi, USB into the Lampi and then turning the volume pot from around -5dB towards 0dB on the Lampi you clearly hear the pot clicking over and the resonance of the clicking through the faceplate in the cans. Eish
Power Lampi down and power it up again.
Press play in Roon, now the noise is gone. So what's solved the problem ... a wireless endpoint or moving to a different location in the house that's not electrically coupled to my main rig? Next I'll run an Ethernet connection from switch to dining room and run the ODROID wired to see if that reintroduces any issues. But bloody hell, what a fiddly process getting this thing to play music.
So, assuming it's now stable I'm reduced to listening in the dining room using cans.