I am presently using a Futaba 9202 servo for my rudder and for the past few months every time i turn on my radio the rudder starts to flutter. I can stop it if i grab hold of the rudder and start the fluttering if i snap the rudder with my fingers. Is my rudder servo the culprit? By the way my 3 other servos behave correctly.

Check the thread titled "servo humm" for information.
-Mike