I've jettisoned Roon from the chain and am connecting to Qobuz directly through the Innuos Sense App, using a Samsung tablet. That was the principal reason for trading the Sonnet Hermes for the Innuos Pulse Mini. While I do miss the Roon interface, it's just one more paid subscription than I really need.
As for digititis, well, this problem only occurs with streaming in my system. Other digital media (CDs, DVDs, BluRays, and anything that comes through the Roku box) do not exhibit this problem and in fact sound really good unless the recording quality was bad to begin with (e.g. any number of YouTube videos). I have perfectly sufficient power conditioning--Furman Elite PFi15 and Core Power Deep Core on a dedicated circuit. Power cables are all upgraded and are definitely up to the job.
I'm convinced that there's a weak link somewhere in the chain, but I just don't know what it is. Thanks, Steakster, for the discussion forum links. I'm still reading through those.