Crash in Loiter Mode, How can I avoid new crashes in this mode?

Hi Everybody !
I had a problem last day with a steadidrone MAVRIK X8 that crashed by itself into loiter mode. It was a bit windy but not too much so I assumed that it should not have been a problem for that drone. I would like to understand the reasons of this failure before flying again.
After a while in loiter Mode, the drone began to rock from the left to the right, more and more, then it crashed on the ground.
This drone is composed of a 3DR Pixhawk, with a 3DR GPS

Here are the log Datas :

Thank you very much for your answers

the behavior resembles empty battery, you do not have voltage/current logging, so it’s hard to say.

Hello Andre-K,
Thank you very much for your answer.