I´m not sure what exactly caused such a sudden descend.
Plane: History of 169 flights/missions. 167 successful and 2 problems (logs links posted here).
1200 mm (47 in) wingspan flying wing; 1,7kg; 3DR Pixhawk mini.
The plane entered Descend Mode while executing a mission @ 230m AGL (about 1000m ASL).
I can see that the altitude setpoint goes to 0m ASL causing the plane to rush to the ground.
I would be immensely thankful if someone could help me to figure out.
2018 incident (apparently the same issue but recovered before descend mode kick in):