Aliron servo jittering

when connected RFD900X then aliron servo jittering but at disconnected time no jittering, how can solved it,
plz help me

How are you powering the rfd900? They may consume the power that the pixhawk cube could not give for a long time. Please power the module with external 5v voltage regulator.

rfd power give extarnay

1.You need to confirm whether the source of servo jitter comes from the pwm output of the flight controller (check the RCOU from LOG file) or the electromagnetic interference direct from RFD900X.
2.Some servos are sensitive to radio frequency electromagnetic interference. Have you ever tried to replace other brands or models of servos?
3. Check the wiring ground loop.