Recently I had a strange crash which I couldn’t understand. I had a quad and it operate normal when I manually take off (manual mode) and then switch to position mode, the quad can hold its position well (with good GPS lock). Then I tried to use QGC to command the drone take off using the build in “take off” button, the quad take off and reach its take off altitude, then suddenly, the quad start drifting while drop altitude, in the end it smash into the ground.
Here is the log
After reviewing the log, I couldn’t find a reason why it acted like this, could any one help?