Qobuz stops playing via Roon.

Laptop isn't hardwired to the router. Maybe I should download the Roon software to the desktop which is but it's in a bedroom that's just off the listening area. Thanks in advance for your help :)

I had the same problem.  It was really frustrating having moved completely to streaming and never knew if / when I could enjoy my system.  Ended up buying a Small Green Computer -sonicTransporter i5 which took care of all my streaming issues.  During the process I moved my entire music collection from my NAS to an SSD internal to the i5.  It cost a little money but I could not be happier.  Andrew Gillis from SMG was also very responsive and great to work with. 

It’s very frustrating because my download speeds are 40 mbps. Have plenty of bandwidth for playback. Think I’ll try and download Roon on my desktop which is hard wired.

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.