Shorted z stepper motor wiring

I was working on a pocket cut and my z axis dove down all of a sudden. I got an error message alarm 8. Pull off travel failed to clear limit switch. I disconnected the connector at the z axis stepper motor and found that one the connector wiring was burnt. Any clues what wound cause this to happen?

Arcing due to an intermittent connection. The intermittent connection could be due to corrosion, dust, poor fit, bad crimp, etc. When the arcing occurs, it causes heat which causes more corrosion and issues with fit which causes more arcing and so on. If you have the skills to do so, replace the pins or connect in another way.

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