Last Fault A 4098 OVER VOLTAGE

[Axel]

It also happened to me once (so far) with a brand new 250 Pro unit, playing under normal conditions. The music stopped for a couple of seconds, and then resumed. The reply from Devialet (paraphrased): it's a very rare issue and they're working on a Firmware fix for it. However, they were looking for the description of the conditions under which it occurred. So, it would be a good idea for you to report the issue to Devialet, to raise their awareness.

This goes against what I was told. When I queried the A4098 Over Voltage, Devialet told me that the fault was with my wiring, that the amp. was just protecting itself and not to worry about it, but to get my mains installation checked by an electrician.
Seems that they'll tell you any old bollocks just to shut you up!