One Landing Gear leg retracts on its own

I have a Pixhawk with four retractable gears (4) connected to the aux channels. When connecting the pixhawk to the Lipo, everything is fine first.
But after playing the first jingle, one of the gears retracts. That is very inconvenient :wink:
What could be the reason for this?
After arming, i can control them normally with channel 9.


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Did you connect all Gears to one AUX Channel or on different Channels?