I have run into a strange behavior of the servos using PX4 (1.11 stable) on Holybro Durandal.
When the power to the flight controller is cut, the servos (being powered from separate source) are driving to their endpoint (in the high-pwm direction) and stays there until the flight controller regains power. However when I disconnect the servos from the signal ports they have normal behavior, implying the cause of this is in the flight controller.
I have tried to find failsafe parameter that could affect it but with no success.
Does anyone experienced similar problems, or have idea what can cause it?