Hi,
this is an interesting case. All went good so far, no problems in FlightLog. I have cut a little bit more than one minute from this flight. The trouble starts at 08:46:50. The H lost height and speed without reason, pitch and throttle unchanged. At this time H was 250m away over water or whatever this is (salt fields?). Descending rate is 2m/s. (1)
Operator stops (pitch neutral) and still throttle neutral, should hold height but still decending and lose speed. Either there was too much wind at this time or already motor problems. Descending rate increases to 5m/s. (2)
After that, speed is increasing again till the motor 4 is cut. I think this is caused by sink rate (z-axis) because the distance is not increasing as fast as before.
At 08:47:05 the operator switches to Smart mode and the copter is going to Follow-Me mode.
But then at 08:47:06, during full throttle and full pitch (understandable, when copted descends fast without reason) the Motor4 stopped with error. (3) There should be a 5-Rotor Mode message on ST16. But 5-Rotor-Mode is not working, the copter still is going down with descending rate up to 8m/s. Shortly after Motor4 was cut the copter roll from 0 to 180° and this was it....
I think, this is clearly a warranty case for Kaltenkirchen/Germany.
br HE