I am a new user of my brand new Tormach 1100. It will reference X axis and Y axis, but not Z axis. Have looked at limit switch and appears to be fine and the switch is connecting. Machine does not stop when going down. I see no errors on the diagnostic page until I emergency stop and then the X, Y and Z axis boxes on the left turns yellow. Z axis making rough, loud noise when going down also. Any suggestions would be greatly appreciated.