I have been having EXACTLY the same problems with my Sonos system. It drives me crazy. It’s gotten to the point where I just don’t use Roon with Sonos and only use it with my full HiFi system. Makes the investment in Roon pretty questionable.
I’ve updated my router, my cable modem, and my cable plan. Network is very, very stable and has a very long reach, and has been adjusted in accordance with Roon guidelines for the specific mesh router system. Have tried removing all “older” generation Sonos products and updating to latest S2 app, and still having significant issues with Roon. Last Roon update seems to be even worse, but that could just be my own perception. And have tried wired with SonosNet and WiFi both, and it just doesn’t work as well as it did six months ago. Just seems to keep getting worse with each update.
Anyway, I feel your pain!! Best of luck and hope Roon conversation with your BlueOs manufacturer resolves your issues.