I suspect something has a corrupt link
1st thing I would do is a power cycle on the whole system.
It needs to be done systematically to correctly establish LAN & wireless links.
Shut down everything that is connected or associated with your network
Leave the router off for 5 or even 10 minutes: This allows the ISP to recognise that the router has gone offline.
First the Wireless Hub (router) - let it fully complete its start process.
NAS
Naim
Control Device (the app) – in some cases of network discovery problems it might be beneficial to reset or even delete & re-install the app.
Thanks a lot. The order of resetting makes a difference!
Now the Naim plays from the server, but the Naim is not visible for the app.
But happy with this, try it a few times more until they are working both. Thanks a lot!
Only the wireless hub, it must be refreshed & running when each of the clients comes on line.
If the Naim is not showing on the app after the system power cycle, I would delete the app, power cycle the tablet/phone to clear its cache & reinstall.