Running tests today on my 100w laser. After creating about 10 Tests at different Heights I pressed Start and Nothing Happened, except out of the corner of my eye I saw Flames around the Positive end of the Laser Tube. was just for a split second, I checked over everything and next attempt was back to normal, about 5 more tests it happened again. Only thing I did was remove the Lens, Clean it, Put it back and that's the only change. Maybe I put the Lens upside down? The Curve Side, Upwards or Downwards towards the material?