Brand New Naim Nait XS 3 Loud Humming - Please Help

[AndyR]

Have a look at this thread from ~12 posts down…

Massive sudden hum - frightening!

At about midnight last night, there was a sudden and loud hum coming through my system. It woke the wife and I up and thought there was someone smashing down the front door, quite frightening actually. I left the 5si on (as usual) and the volume was pretty low - set for casual TV viewing with the TV & DAC as the source. From now on I will turn the volume all the way down but does anyone know why this happened?