I had this exact same problem. I have 30 years of experience troubleshooting electronics and determined that the Z-motor side of the connector was at fault. I didn’t want to void my warranty by hardwiring it. I sent videos, etc. Carbide was real nice about it and sent me replacement cables for the Z Motor three times. They didn’t want to send me a new motor or Z-Axis assembly. On the 4th failure I went ahead and hard wired and heat-shrinked a new motor-side connector that I snipped off one of the sets of cables they sent.
No problems since.
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