Thanks a lot...
I don't remember pulling the left stick
OK, I'll admit, it was poor flying, and shortly after taking off, I regretted it. I rarely use the RTH button, but was contemplating it, at the time of the crash.
If I may interject here, as I recall, I regretted taking off, after realising that the landscape I had hoped to photograph, was utterly black, and unlit (night flight, in the morning the early hours, in the middle of nowhere), but the landing was going to be tricky.
I'd brought it closer and down, and was contemplating RTH when it became obvious it wasn't airborne anymore.
I fully accept it was piss poor flying, I admit I'd lost sight of it, even relatively close, I'm just glad that a) it was hardly damaged, and b) I don't have mechanical issues with the motors.
I struggle to believe I held the left stick down, and explain this by the fact that it is 30C here, at night, while my drone and controller are 10 degrees lower, spending their non flying time in a temperature controlled room. I suspect condensation played its part, in making undesirous electrical contact. That's my story, and I'm sticking to it
Unfortunately that was unquestionably stick input. The stick values are smooth and consistent at the end:
That's clearly full down throttle - not electrical noise. In any case - the sticks use a Hall Effect sensor, not a potentiometer. The other obvious comment is that you appear to use both your sticks as 4-way switches - either on or off:
I'd suggest trying more progressive control of the aircraft.
This is your vertical profile at the end of the flight: