With AP 3.3.2 and 3.3.3 after landing the copter could not be disarmed and the props continued spinning.
Pressing the security button stoped the motors.
In order to check the issue again, I pressed the security button again and immediatly all motors started with full power. ( with 60 A ,3 times more than hovering)
The copter jumped up an the left prop has hurt my little finger dramaticaly. The nerv is cut but the bone OK.
I find that this is a really issue that pressing the security button does not disarme.
e.g. mecanical tool machines don’t start again after power interruption.
Reflashed wit AP 3.2.1 this disarme failure didn’t happen.
Of course, the TX was calibrated correct.