I’ve a new autopilot pixhawk4 with orange cube,here3 gps, rfd telemetry, brushless motor. I completed installation & parameters configuration for fixed wing. Auto tuning done successfully, and i got different PID values. Second mission started by manual take off and flight in manual mode for 4 minutes in Alt 180m. 4 wp had been written in 250 Alt, then i switched mode to auto mode through the RC. After mode changed suddenly the plane had unstable behavior, i tried to change mode but no response and i lost signal in ground station. The plane dive down vertical in full throttle and crashed.
_ I used separate batteries, one for cube and one for motor and servo’s.
_ log file analyzed and there is no data after switch to auto mode.
_ Vibration, battery voltage, throttle command, and other parameters reviewed it’s all normal.
_ error compass variance massage appear before and during fly.