This was the problem and turned into a massive thread, plus quite a few others by other users.
The good news is - the last update actually solved the problem!!! Hooray!
This is very good and also shows it was not my setup that was XXX it was a bug that has been crushed. Glad about that. One always feels so guilty stating problems, since it feels like it is your own fault.
So, well done Roon! But please be a bit more responsive, when you are actually working on a fix. Seeing a thread be closed and dry up, seems more like forgotten, than - oh they are gonna solve it.