If you've used the program a bunch of times, I'm going to guess there is something wrong with the table mechanically. Is everything tight? I've had it where I've had a loose pinion, a belt about to finally break apart, a loose setscrew, binding due to lack of lubrication, etc, etc. I've had bad geckos, bad boards, bad motherboards on computers. I've even had cables partially plugged in that will ever so slightly come just loose enough to keep the machine running but the router turns off. I've also had loose wires going into the BOB. Just a few ideas from my experience.