@Diver99 This is very informative, thank you. Are you sure about the roll back? I just use the NDS for the DAC and am very happy with it so and very very wary of upgrading any Fw. Sad state of affairs.
I want to add that I have another issue with RAAT multi-room being out of sync. I have received great communications from Steve at Naim, so the issue of communication does not exist with every problem. Hopefully this will be sorted soon.