Thank you again for pointing this out I never guessed it could be an issue with the wiring.
I’ve been sort of panicked about this mainly because of the uncertainty involved. I’d thought all along it had to be a backlash nut or leadscrew issue. I feel much better now with some knowledge of what may be causing this.
This thread-
https://community.carbide3d.com/t/wire-harness-issues-shorts-in-molex-connectors/64937
mentions the connector becoming warm causing erratic behavior. As the cut that failed is rather long, approx. 13 minutes, I’m wondering if the failure was a combination of the connector heating up and the rapid shifts in direction at the end of the cut…