I GAVE UP ON QOBUZ!
I installed the Qobuz Windows app on a Windows10 Pro, quad core I7 machine with 16 gigs of memory. This machine is only used for my audio system, when running Qobuz (or Tidal) it's the only app I have running on the machine, with the screen saver turned "off". The PC is attached to my home network with an ethernet cable, and my Comcast service has about 185mb down, so from a connectivity perspective, I should be "good".
The whole time I used Qobuz (for about six weeks), I'd say only about 25% of the time did the app seem to work. Typically, the app would be doing who-knows-what, consuming more than 75% of the cpu, not offering a pointer to select anything. When I'd be able to select things, attempted to get a hi-res album to load, the play/pause control would be replaced with a spinning icon, most of the time never load the first track. Sometimes when it would load the first track, it would play for a while, then either stop, or skip to the next track.
I tried accessing Qobuz via their web client, and using Roon, same result.
So, last night, I reached my limit and cancelled the service.
To be fair, when I'm streaming from Tidal, very occasionally it'll be playing a track, then stop, with the icon spinning, but this is VERY rare.
So, I think I'll stick with Tidal.