I just red-tagged the Blue Laser tonight. It had been giving me minor trouble with Z axis (focus) adjustments recently, but as I tried to load my final piece tonight it just completely refused to raise above ~1.5" below focus.
It makes a nasty stuttering sound and I can see that the drive belt is skipping and jumping. Will post a video as soon as I can get it uploaded.
I think this happened before a while back. Z axis needs to be calibrated. When it happened before, I manually focused it and the display settings on the laser were different than what was entered in the UCP. I used the settings from the laser display when I manually focused and it worked perfectly.