Are you having issues with your spindle dropping RPM's and/or not fully stopping when told to go 0 rpms?  Then you likely have a loose PWM cable thanks to the Molex internal design.

The problem is these two pins are backing off resulting in poor contact between the PWM wires and the internal controller.

A simple solution here is to pull the wire out, press in these pins to fully seat them, then add some hot-glue behind the pins like this: