So today I got scared to death. In loiter mode I was hovering when it started to climb fast at 1/2 throttle and had no control, straight up! It climbed to 130m (according to the log) and then landed itself. Luckily failsafes for battery and geofence came on. Landed slightly fast but didn't cause any damage at all. I am just scared what happened may happen again and not turn out so well. Log is really interesting to look at. Don't have any idea why it climbed to 130m.
4x 1350kV NTM motors
4x Afro 30 AMP ESCs
DJI 450 flamewheel
Pixhawk, 3DR power module and GPS. All original from 3DR.
Fatshark predator FPV @ 5.8GHz
Arducopter 3.1.4(?) Newest
If someone can take a look at my log and see if they can see anything. A few other people have similar problems and it seems to be in the accelerometer data?
Thanks for all the help!