FYI - Roon has been terrible with M zones for quite a while. There have been significant code issues causing memory chokes and general bad server performance. The M zones seem to be quite impacted by this (you can see it in the logs). However, recent updates and fixes to Roon pushed into their EA (Early Release) program have been improving things. It's still not 100% yet as the memory issues still seem to brew up after a day or two between reboots.

So, my point is that if you are on the main production release of Roon, you may not have seen any improvements yet.

My experience is that with the ID41, the network glitches and zone disposal annoyances, have reduced with the new firmware. Roonserver still has some work to do.

Hope that helps

Rgds,
Nick