Hi. I have a problem with jogging using the keyboard. Whether the head moves at full speed or at the slow jog percentage speed seems to be random. I can cut in one direction at, say 10%. when I stop and reverse direction the head may still move at 10% or it may revert to 100%. If I alternate between the left and right arrow keys it will eventually revert to 10%. Sometimes pushing the shift button gets it to revert to 10%

This behavour is not condudive to quality milling, so any help will be much appreciated.