Good thread this. Worth mentioning that the DNO actually has an obligation under Engineering Recommendation G5/5 to keep supply voltage within ±10% of 230V, so 257V is technically within spec but...
@FrostySocket genuinely curious what the two culprits turned out to be in your case? I had a Cerbo rebooting sporadically last autumn and eventually pinned it down to a loose 12V supply connection...
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