When the drone stops (apparently without reason), it lost (temporary) connection with the controller and doesn’t know what to do.
This happened at points H & J, where the drone switched from Joystick mode to P-GPS mode and back to Joystick mode.
The Mini 3 is a so called VSC drone.
Have a look at this thread:
Also I would delete all waypoints halfway (3, 6, 9, 12, 15, 18, 21, 24, 27 & 30), they serve no purpose at all.