Camera gimbal creep* and non centering

(*Don’t know if this is in the APM code or in the planner)

The yaw of our camera gimbal creeps very slowly to the right, it’s on a 180 degree servo while tilt is via a brushless gimbal controller. I’ve tried every adjustment I can find including the deadzone but this axis still creeps slowly. It does it on different servo’s and different joysticks including digital and gamepad. Any way to fix this?

There’s also no option for centering so if you have no view of the aircraft from the camera then there is no way of knowing which way the gimbal is actually pointing or to reset it to center.

as far as I can tell MP would have no effect on this.