I found that if I remove the flex cable from the cutting head before scanning that I do not risk lash when opening the front cover and then closing it again and the head seems to move more freely.
I had to stop my scan once to remove a piece of trash on my scan object. When I closed the cover, the probe moved very shaply and unplugged the probe. I decided I didn't want to distroy the probe so I removed the flex cable.
I'm not sure what CW thinks of this, but it has worked fine for the last 80 scans.