Z Axis Calibration Issues  

Z Axis Calibration Issues

We have a Prusa Mini which is acting very odd.  Whenever we try to do the mesh bed leveling or calibration it keeps having issues with the Z axis.  The head keeps moving little by little away from the bed during Mesh Bed leveling and the calibration wizard sends the Z axis to the top but it never comes back down and either gives an error or sets the z axis 0 point about half way between the top of the bed and the top of the z axis. 

Needless to say, I can't print anything on this printer.  It's almost like it loses it understand of where it is on the z axis so it doesn't know how far up or down the head has traveled.  Minda is powered and shows light on top and we have unplugged the z axis motor and plugged it back in.  We have been staying up to date with firmware so it's running the latest 4.1.0 code but it's still doing this.