OK, I'm cutting 1/32" neoprene rubber (but have noticed this problem with other materials as well). I'm making a gasket, 14" x 1" with 100 rectangular holes that are approximately 0.125" tall and 0.075" wide. As the laser progresses further into the cut the power apparently "fatigues" so that while the first holes are fine, the last 20 or 30 do not cut all the way through. The panel meter remains steady as far as I can see. The outline cut starts out fine, but by the end (inch 30) the cut is not through. Speed is 10, power (set) is 60%. I found that if I "pause" after every five small holes and immediately restart, all holes are fine. If I pause every 5 seconds of the outline cut and immediately restart, it too is fine. What's the problem and how do I fix it? Thanks.