Hi Somppsa
I have had the same experience as you and cancelled my Roon subscription. It’s a fantastic software solution, but it sounds so much worse with my Innuos ZEN MK3 that I had to make a decision. The Innuos Update 1.4.4. which is much more stable and sounds even better helped me with this.
Innuos Server Integration In absolute order from good to bad in my chain
1st UPnP Streamer
2nd Roon with Experimental SQueezeplayer
3rd Roon Core
The differences are clearly understandable and dramatically.
It hurts me too, but I chose the sound.