Qobuz stops playing via Roon.

I may be mistaken but I don't think your download speed has a lot to do with your problem.  It is your local area network(inside your home)where your interrupts are happening.  Either memory on the computer running your Roon core and /or wireless interrupts, traffic on your computer, security scans whatever.  It can also be interrupts from other wireless networks ie your neighbors etc.  if you can try running Roon remote(laptop)hardwired to your network or run from your desktop computer which I believe you said is hardwired and where your core is running.  

Testrun you may be absolutely right.  Everything you mention could be the problem.  Think I'll start with the desktop as the core 1st and proceed from there.  Currently my core is the laptop which isn't hard wired. 

Hard wired my laptop and so far so good.  My desktop couldn't run the Roon software as its too old evidently so inserted the laptop and all is well. 

@samzx12

Thank God! Geez 😎

I had the same experience.  Consider a dedicated music server.  It is how I got to Small Green Computer and never looked back.  I have no tie to SGC just a very happy customer.