I have Futaba Digitals in my Sukhoid and on the left elevator and left ailoron I have a bad flutter or jiggle when I stop moving the control surface. I was wondering if I need to watch out for it. I know they are known to do this but wondering if there is a point where I need to try to fix it so it doesnt do it as bad. We have two nicad batteries in the plane and can only get 2-3 flights out of it. Now here is the funny part. We called futaba and they said we can not use lithium ion batteries with these futaba digitals. Or they at least said they reconmend not to. They said Nicad batteries would stop the jiggle but it really didnt. Please let me know what I can do.

Are the packs 4 or 5 cell packs.
If 5 cell pack, does it jiggle after a fresh charge then stop after the first flight.
If you have one servo that has a bad deadband in a ganged situation, then it will do that.
It will also do it if both servos are fighting each other.
They will find this common point and oscillate.

If there's any slop at all in the linkage, the servo can "bounce" back and forth in the slop (bouncing from one side of the dead band to the other). I've had this happen on my Funtana's rudder. If there's no slop then this is not the problem.

Same thing on my dads Cap rudder if the pull pull lines are to loose then the servo jitters.