Hi,
This sounds like a fault and I should send the kit back but thought I would post in case of user error. Just bought an ND5 XS2 and connected it to my 25 year old Nait 3 and was working great for about 4 hours then part way through a track I heard an audible mechanical click and the music stopped. The power button is lit green, but the naim logo is not lit and there is no led light for the network light. Hence can’t detect through the app. Also when pressing the power button it won’t restart/respond.
I left it over night and it powered back up this morning and started playing but the same thing happened again.
That doesn’t sound right. As an aid to fault finding you could set it in the app to “never” go into standby. If that solves it then you know that what is happening is that it is going into standby…