APM 3.3.2 DIY H-frame copter in Auto or RTL suddenly veers off course
SW: APM Copter 3.3.2
HW: DIY quadcopter (H frame), pixhawk clone, power module clone, 915 kHZ telemetry clone, ext. compass + GPS (the HK clone combo pack), 30A SimonK Afro ESC, 2.4 GHz RC, 2x 4S battery
Flight video (different time, only to give an