I mentioned earlier in the thread experiencing a "short" in the primary electrical feed to the cabin from the generator.
Granted, it was intermittent and we were still preparing to taxi prior to flight so not so serious.
All electronic systems lost. Engine grumbled and ran rough for an instant as the fadec was lost but the revs stabilised while in the hover.
Still enough power to put it back down while we tried to figure out what had happened.
It kicked in when collective was being raised and a minor vibration kicked in.
Felt similar to the drop when plasma is turned off during pre-flight.