Hi @nuwriy, completely missed that you asked me a question here, sorry for that.
You can read up on my setup here Roon stops playing music
The only difference now from then, is that I have replaced my Apple router with a Netgear Orbi Mesh system.
I have also tried to use a Raspberry Pi4 as a bridge (with Ropieee).
My issues are still there though, music plays for a some time and then suddenly it stops. Roon displays "Select Source (or is it no source found? well something like that anyway) instead of the progress bar at the bottom of my screen.
I have not been able to test with a different core. That would most definitely solve my problem but as I’ve said before, it feels like I am not alone in having issues with MacOS, and there never seems to be a solution. Could be that MacOS is just not good enough for Roon, not much to do about that but switching to another OS.
Still have a feeling though that there may be some setting one can change (in Roon or MacOS) to prevent this from happening…