Well, don't know so got to ask. Are you running a one shot lube system on it? Lube is the first thing I would check on the ways and the ballnut. I run a little program that jogs all three axis while I operate the one shot when I first fire it up and later in the day if it's a long session. Even add lube manually to the Z ways at times when a program is running, especially if there is a lot of Z movement. Use Vactra #2 way oil on the lube points, it seems to stay in longer. At least that been my experience.