@support, looks like I spoke too soon unfortunately. As soon as i tried skipping a few tracks and rewind another, synchronisation totally out. What is worse, one of the zones (Naim Nova) disappeared soon after and I had to reboot it for the zone to reappear in roon.
As I skipped a few tracks I could actually hear the music slow down for a few seconds which was really strange.
For the time being I am going to scale down my use of Roon as I am unable to achieve reliable multiroom playback. I realise this is probably a complex problem and that it might not be easily addressed.
Kind Regards