Pixhawk/PX4 ignores RC-commands


We’re testing with a Pixhawk with PX4 1.9.0.

The RC is connected and stick movements are visible in QGroundControl, but PX4 doesn’t respond to arming or a mode switch sometimes. After a couple of restarts it works just fine.

Is there something to do, to improve stability?

Thank you in advance.


Do you have a buzzer connected that beeps when arming fails? And do you see any error messages in QGC when you try to arm and it doesn’t work?

Also, what RC receiver are you using and what Pixhawk?