Erratic Uncontrolled Descent Crash and Bounce up to 95m

ArduCopter Copter 4.0
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1

Hi all,

Faced a very erratic crash with my drone. After completing a mission when the drone was RTLd, came back to home position and came down very fast. At much higher speed than the set 1.5m/s. Crashed onto the ground breaking all my landing gears but to my surprise it started climbing again. Climbed to a height of 95m before coming back down again, and crashed and disarmed. Kindly help me understand the issue here. Attaching the telemetry log for the flight.

https://drive.google.com/file/d/1ALaa1MvsKF7zoYyQYWRU-qZ0K7htS2QX/view?usp=sharing

2

A Tlog won’t be of much use/ Post the .in flight log.

3

Can you explain exactly what you will look for in .in log which cannot be found in telemetry log?

4

Everything. The Tlog data rate is too slow for any useful troubleshooting.

Wiki here:
Logs