From the support email:
If the lower power setting works, but higher power does not, it’s very likely that you have electrical interference of some kind. It won’t be a software issue.
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Make sure the laser is grounded properly. Often the ground wire is attached to a screw that is bolted to the frame after painting, and the paint prevents a good electrical connection.
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Make sure the board itself is NOT grounded to the frame. Use plastic standoffs if you can.
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Use a good quality USB cable with ferric beads on at least one end, if not both (those are the bulges in either end of the cable, about 1" long, 1/2" around).
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Check that the wiring inside the laser is relatively neat, and the wires going to the high-voltage power supply from the board don’t coil around anything else, as this could possibly induce noise in other signal wires.
Also, when posting speeds, please include units. 2.36 mm/sec is very different than 2.36 inches/sec.