Harlequin

Yes. Exactly what you are describing. It just reboots. Comes up with the logo and, if I still have the fire button pressed down, starts firing. It can do it 3 or 4 times in a row and then be fine for several hours. Or only once. Will attempt to get a vid of it doing it. I think what you are suggesting may be correct as I was just playing with it and got a very brief flash of a message saying "Shorted" - with no atomiser attached.

So I was only just saying earlier today how much I love my VA Primo but tonight - after having had it for about 2 weeks - it has suddenly started randomly doing a power reset when I press the fire button. I've tried different batteries and different toppers but it will even, I've just discovered, do it with no atomiser attached. I know that some of the early DNA75 boards had some issues with measuring resistance and such but my Google-Fu cannot find anything relating to this particular problem.... Does anyone have any knowledge or experience with regard to this issue? Pic for attention: