K1 Max issue

Hi

I have a couple of K1 Max printers. One works spot on every time, with the other sometimes it will print as expected and other times I get this message

It is not down to what I am trying to print, for example today I wanted 4 of the same item printed and the first 2 where cool, printed number 3 I hit this issue again and after a few attempts and a restart I switched printers.

Can anyone tell me what os occuring please.