Here is the email from Naim, at which point I just hard wired it and stopped snagging. Seemed unaccetable to me, but since I’d solved it I gave up chasing.
"Thanks for your email and I hope you are well.
Unfortunately, the issue you are going to have with your network and the Netgear Orbi is that it is classed as a MESH network
Unlike a network that consists simply of a router and a number of WiFi extenders, where each extender ‘node’ reports directly back to the router, and vice versa, in a MESH setup, the nodes talk to each other and form a chain from your device, through a node, through another, and through however many it takes until the signal gets back to the router. This can sometimes have the effect on the information being sent that Chinese Whispers has on a message - the longer the chain, the more likely small parts of the information are to be lost or wrongly conveyed.
A normal computer or smartphone, tablet, etc. all have the processing capability to fill in these gaps - if someone removed the wheel of a car, you would still be able to tell that it was a car, and treat it as such. Devices like smart TVs and smart speakers like the Mu-so, QB, and other smart devices like the Uniti Range and our streamers, despite the moniker, aren’t all that smart in that regard - if they don’t receive the data exactly as they expect to, then issues can occur.
Furthermore, while your MESH network will appear on your smartphone/tablet as one, single network, each node is in fact its own network that both broadcasts to and receives from the others. What this does is creates multiple access points across your house, and sometimes the signals from/to the Naim devices can miss each other, kind of like two people going from one side of the supermarket to the other but going down neighbouring isles so that you never actually meet the other person.
My only real suggestion when doing a bit of research on the Netgear Orbi is that a wired connection will be more suitable for your Mu-so if this is possible.
I hope this information helps and if you need any more support from me, please don’t hesitate to contact me."