However, make sure you check at all your Sonos components have moved over, and are showing as ‘wired’ - WM: 0
https://support.sonos.com/s/article/3237?language=en_US
If your components are not showing wired, then turning off / turning on of your wired component can sometimes make the components join.
Or by changing the Channel which Sonos is using can also get the components to join the ‘Wired’.
I’ve previously had a lot of dropouts, see here Roon Dropouts - Why? - #6 by jamie
However, I haven’t had any for a over a month now. 