I did notice that there is a low level thrumming noise at times - that seems to come and go. I couldn’t locate an error log.
There seems to be a physical link to my Faderport. As the slider moves, so the problem chases it. Keystrokes, indeed any keyboard activity is problematic, risky actually!
I’m not expecting any official support from Steinberg. I reckon they’d say it’s more of an operating system issue.