The drone just went off, once it landed. The flight controller is currently off , it a CUAV v5.
This is the link to the file and the video
https://drive.google.com/drive/folders/1_CuvNk7WVZuA1x82EIj73GqvDBGRzOYE?usp=sharing
The drive link is access controlled. Remove that for help.
Sorry for the access restriction.
https://drive.google.com/drive/folders/1_CuvNk7WVZuA1x82EIj73GqvDBGRzOYE?usp=sharing
Looks like motor failure or battery failure. But I only looked at the video, not the log.
Can you please take a look at the log
Motor 4 has failed at the last instant. The battery seems to be fine. Check the motor and ESC for connectivity and run a bench test.