Z axis trouble

I have xcarve using easel program. While probing the z axis has a slight studder to it going down. Going up seems fine. Then while carving especially with vbit I am gaining height. Simple carves are fine. Boards I use are level. I have a upgraded version. Any help would be appreciated. In the middle of doing Christmas orders and this is the first time in almost 3 years having any issues.

Have you checked for loose connections to the Z-Axis Stepper motor?

{:0)

Brandon R. Parker