GRBL Alarm 3 is “Reset while in motion. Grbl cannot guarantee position. Lost steps are likely. Re-homing is highly recommended.”
What are the travel limits of that machine? The “on or near” thing doesn’t count commented out lines, so it’s probably closer to the bottom of the lines you’ve posted, which makes me think it’s either the X or Y axis going out of bounds - Both of them are steadily increasing in the code shown.