Over Voltage fault (A4098) fix?

[AlexS]

I used to get the over voltage alarm regularly.

As far as I know it's nothing to do with the mains supply voltage, it's an internal voltage alarm. Since the CI upgrade and the later firmware it's never happened again.

I assume you can get this fault under different conditions. In my case, it DOES seem to have to do with the mains voltage: I usually get the fault in the evening (around 11:15pm, to be precise), every two or three weeks. The problem had never happened to me prior to the 250 Pro upgrade (and the following CI upgrade did not make it better or worse). Is not fixed in the latest FW.
According to Mathieu from Devialet, the 250 Pro power supply is much more sensitive to voltage fluctuations in the mains. They are looking into possible fixes (I don't know how actively), but meanwhile I wanted to check if someone had any luck fixing the problem with a voltage regulator.