Hydrojet cutter freezing up

[megaminer94]

I set up the hydrojet cutter as per the manual, and have ore sent to it via conveyer belt and another belt to take the chunks away. After roughly 12 to 24 ore blocks, the machine freezes up, the ore stopping just before the cutting head and going no further, the cutter in neutral position.. It has plenty of power and water, and fiddling with the levels and controls on the mechanisms involved doesn't restart it. The ore blocks pile up on the belt, and the machine doesn't cut them, and breaking the machine to rebuild/reset it means I lose the "backlogged" ore forever.