Crashes on Loiter mode

Hello everyone.
Can any of you help me crash when my copter is in Loiter mode.
It lifts and flies as a dream, Stabilize mode, and lands in RTL. Even Alt. Holt works without worries. Yesterday I lifted 5 times and landed 4, 5th landing ended in a crash at a height of about 10 meters. The cop just turned into the air and fell into the ground.
The same thing has happened before but at a lower altitude without any damage.
I send with links to Telemetry logs and the movie from the flight, even some pictures on UAV