The gaps are because your laser is producing constant power output, and slowly accelerating up to speed, then down again, and because the output power is constant, as it goes faster it gets lighter - the material has less time to heat up. Slowing down the job will give you a more consistent burn - that's the whole problem there. For this test, we recommend using a single-color matte surface for optical mice and either a matte or glossy dark surface for laser mice. 4) If these steps still do not work, please try the mouse on another PC. 4a. If the same issue persists on another machine, please contact us.