DJI Phantom 3, Crash

Hello everybody
I am new here and would like to report a crash with my drone today
I uploaded the log file here.
In the middle of the flight at 53m, the drone has turned 180 ° downwards and fell on the ground at full speed.
Can someone explain the reason?
Thanks Alex.

This has the indications of a lost prop. If you retrieved the aircraft and it will power up, the aircraft .dat may tell you for sure. Although the P3S does not record the motor data, it could be determined from the PWM data.