Most likely, the timing of this issue beginning after you updated LightBurn is purely coincidental.
Do you see any error messages in your Console window when your laser stops, or a ‘start up’ message that tells you your laser’s firmware version and some other information? If so, please copy and paste the output you’re seeing here.
Your laser may be losing connection due to a loose USB connection, a USB port sleeping, static discharge causing the controller to reset, or insufficient power supply leading to a brown out condition.
Here are some resources to help you troubleshoot these issues:
