Water level issue

So I’ve adjusted the water level before my cut. Have done this a few times, just to make sure the machine is happy with the water level.
All seems good in the world.
I then start my cut, I barely get a minute into the cut, and it says water level too low.
Doesn’t matter how much I add, whether manually, or through the firmware option, within a minute, I don’t have enough water in the tank.
How do i fix this? What do I need to look at to see where the issue may be?