Drone Crashed while doing loiter speed about 7m/s or in normal winds

ArduCopter Copter 4.0
2

Update to ArduCopter 4.4.4 and follow from the very beginning every single step:
Methodically tune (almost) any multicopter using ArduCopter 4.4.x

After that, post a new .bin log file here. We do not need a .param file.