Z Axis Randomly Reversing Direction

Hi all.

Running a job this morning on my FoxAlien 4040 xe pro and half way through the job my z axis reversed and instead of lifting up, dove down deep into my waste bed.

Turned the machine on and off and sometimes the z axis is correct, sometimes it's reversed. It was working fine last week. I've checked all the connections and everything seems fine.

Tried controller it both via laptop and offline controller and the problem persists with both.

Anyone got any ideas as to what's causing this, any help would be appreciated.

Thanks.

Tom