Strange laser stop

K40 GRBL here. I was burning a fill and Lightburn stopped and threw an ALARM 3, which means that the laser was reset during the job. I am also getting ALARM 1.

Thing is, I can run it again and there are no issues. Not a problem with the gcode.

I don’t even have a reset button hooked up to my arduino. Is it possible that endstops are getting spurios signals? I don’t have filters attached.