Are you by any chance using the Comcast XFinity service in the US? I ask this because there have recently been other threads by users having problems with playing Qobuz through Roon which could be traced to some advanced security setting on the XFinity router. Look here:
Qobuz playback through Roon is not generally broken and seems to work well for the vast majority of users. It’s much more likely that the problem is on the side of your setup (even if you reply that it has been previously working well for you) or your Internet access and its security restrictions.