APM 2.6 crash in loiter mode

Hi all,

today after about 4 mins of flight in loiter mode my quad suddenly started turn heavily arround the yaw rate and than started struggling until it hit the ground. Luckily nothing seems to be damaged but I would like to find the problem before I start again.

My setup:

Tarot 650, quad

Tarot 4108, 380 kV motors

APM 2.6 controller

ESC: FVT LittleBee

Video: https://youtu.be/3dUiymwIxaI

Just before the drone started to turn my girlfriend was in control of the radio so I am not absolutely sure what happened. According to the measurement data she steered with the yaw stick to the left and the right again within a short amount of time, maybe a bit to heavy. After this maneuver (about 1.5 sec) the drone did not stop turning to the left and made a turn of about 200 deg until it crashed.

I attached the video (stabilized by a gimbal, and the measurement data).

Thanks for your help in advance!

Ben

2017-02-26 15-09-31.log

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