Just the last few days I have had an issue playing music from Qobuz on Roon. It either takes just about forever to start playing or I just get the light that goes back and forth across the playback controls.
I have tried logging out of Qobuz and back in, restarting my Mac, etc. with no luck.
I checked the DNS settings and they were already set as you suggested. This is only a guess, but I think it may be related to my library size? Once the library had finished loading the issue seemed to resolve. Thanks for the help