This has happened to me SEVERAL times with no rhyme or reason. I 0,0 at lower left corner of table. I'm using a form bit to make a decorative edge on mdf by lowering my Z height then runnnig the bit on the edge down the X axis. I run it down at 1.7 ips, bump it down one or 2 clicks in the Z axis (with the "fixed" button depressed) release the button run it back up the X axis.

Several times the carriage just stops. The default message comes up as if you had hit the spacebar. However you cannot resume. I clear the message raise the bit and give it the JH command and it goes to some arbitrary point as if that was the 0,0 point and stops. This time it went to 9X,14Y and i have never even zeroed my machine there before. I have to re 0,0 and start over.
These times have been mostly when I was doing something manually as opposed to a shopbot cut file but it has happened with cut files. What is the most stable version out now and why is this happening?