Yes. I have tried rebooting my Roon Ready device, my router and my modem. One piece of added information: My Roon Ready device (Limetree Bridge) has its own app. When I log in to the app I am able to play Internet Radio and my Tidal collection with NO problems. To me that suggests this is a Roon issue.
I have two (2) zones. The main zone that includes my Roon Ready device (hardwired) and another zone featuring a B & W Formation (wireless) speaker. And yes the problem is in both zones.
The issue has been solved. I spent about an hour on the phone with ASUS support (I use two of their routers). He walked me through a manual reset of both routers and that did the trick. Thanks for the earlier responses.