The beginning of the video is a homing move, right?
Without wanting to sound harsh: Whatever and however you did calibrate something (see here): As long as the axis is not moving in one fluid motion, without speed change, stuttering, bumping etc, then you just do not need to continue.
You can simply issue a manual move, e.g
G91
G1 Z50 F600 # Move 50mm upwards at your homing of 10mm/s
G90
If the movement pattern repeats, then you either have a severe electrical or mechanical issue.