Had a Z that didn't fault with a simple G code up down test program... but when I went to my run a CAM program it would fault, and lose steps.

Short answer I seemed to fix it by disabling the backlash compensation. It hasn't faulted yet... and I've confirmed it by turning backlash comp back on... it will fault everytime. Turn it off it doesn't fault.

Also when chasing problem I lowered my accel values from 15 to 8 to even 1. When my accel values were under 3 the Z travel was not going to a set 0 point on my dial indicator I rigged up to monitor Z travel Even when Gecko didn't register a fault. Back up to 5 or higher Z would travel correct distance. Why is that?