The laser stops at various times during operation

Can you confirm that you never have an issue in LaserGRBL but get this every time in LightBurn?
If so, then this is likely a setting issue.
First things first, make sure you’re not using mm/s as your units. If you are, change this to mm/min as you may not be comparing like for like in LaserGRBL. You can change this in Edit->Settings if this is the case.

• Smith

  : If that’s not the issue, then can you provide the following? 1. Full screenshot of LightBurn with design loaded and Cut and Laser windows showing 2. Screenshot of Edit->Device Settings 3. Save the design to gcode by going to File->Save Gcode. Save with a .txt extension and then upload the file here.