I was running a 3d file today and about 2/3 of the way through the cut I had this happen. As soon as it came to the end of the x-axis travel on a raster cut pattern the gantry would come to an abrupt stop then reverse direction. Prior to this the change of direction was a smooth transition from one direction to the other. Once I stopped the file and restarted it, everything seemed to be working fine. Anyone have any idea what happened there. As far as I tell, the cut image shows no lost of steps. But the abrupt change of direction of the gantry felt like it would shake the machine apart.