I am using a longmill and laser by Sienci labs. A Lenovo laptop with windows 10. GRBL. I ran the trial software doing several different burns with absolutely no issues. When it said you have 4 days left, I purchased the license and entered it . Since then I have not been able to complete a burn. A few minutes in and it just shuts down!
That’s really weird. I doubt it has anything to do with the license.
This type of problem is usually related to communication between the computer and the laser machine.
When I had an identical problem, the solution was to change the USB cable for one with a ferrite core.
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