Possible Causes:
Drone Cable Distribution Board overheated
Bad Spray Module
Troubleshooting Steps:
See if a update is available for the drone or battery, if so update
Replace Cable Distribution Board
Replace Spray module if replacing Cable Distribution Board does not work. In rare cases, the Power Distribution Board and/or the Aerial Electronics Module might also need replaced
IMPORTANT: If the drone hit a power line or was involved in a crash DJI recommends replacing both the Spray Module and Cable Distribution Board at the SAME time as if there is a short, it would take out a newly replaced board as soon as its installed.
Prevention:
This issue can sometimes be prevented by good heat management of the drone and batteries. See our article here on Tips On How To Keep Batteries and Drones Cool To Prevent Forced landings