I am new to this program. I am using a Ortur Laser 2 (20w) with Lightburn. Sometimes my laser works perfectly and will burn a picture. However, on some pictures it will stop about 1/3 of the way through. It will freeze and burn in the same spot for about 5 seconds and then shut down. The lightburn program is still running. Not sure what I am doing wrong. Has anyone had similar experiences? How do I fix the issue?