I had the same problem with my Nasum A5 Pro. I would get skips and could not be sure the second burn would follow the same path. The advice I was given from another user was to check the belt tightness. Mine were sloppy loose. I loosened the belt set screw and pulled on the belt tail with a firm pull. While I pulled I tightened the set screw. Be sure to do that on both sides. Check YouTube on tightening the belts. Now my engraving are perfect.