The Z is going crazy

Please can anyone give me hint what´s wrong
After half cutting the project
The z axis is going sporadically up and down in small steps
without going down and cutting
This happen suddenly.today
Hasn’t happened before

Check over your z axis wiring connections.
Also consider a wire may be broken internally without breaking the insulation.
Can you jog the z manually without issue?

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Yes I can jog the Z manually
but it behaves alike

Ding, ding,ding. Wiring I suspect.

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Thx JK
It was the black cable on the Z axis connecter on the arduino

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