I have just got a Neptune 3 Max and it powers down consistently at 1.9mm (going into 2mm) tall, ive tried factory resetting, relevelling, changing temperature, changing print speed, changing fan speed and different models but it consistently turns off at the same height.
It fully turns off aswell so I cant try and continue the print.
I cant provide pictures or a video right now but I can in roughly 14-15 hours, sorry.