I need some help:

I had a problem with servo bouncing (3004) on one of my planes. This servo was one of the elevator servos ( UCD3D). After replacing it, I noticed the problem on one of the ailerons (Ailerons are on different channels 2 and 6 ). I checked everything I can and still can not find the cause.

Here is the shocker. Yesterday I was getting my other plane ready for the first flight of the season ( GP Space Walker ), the left aileron was bouncing around the center when released. What is going on here???

The only common thing between the two planes is the TX and my basement where I keep them.

Any suggestions on what to check next. Please note that when I ended the season last year everything was working more than well.

Amer.

"Bouncing" around neutral can be caused by the servo starting to wear out. The feedbackpot may be getting dirty, which can cause some jumping as the wiper passes over a worn spot. Motors can start getting weak and so it won't hold as well. Sometimes, it's the control surface and linkage getting worn, so that center isn't well-defined, and the servo hunts a bit. You'll get the same thing with worn gear trains.

If the model's been flown a lot, or the control surfaces are large, gear trains can loosen up and the servo's center will become less defined, and the servo will also hunt a bit. Worn gears can cause hunting when you move the servo to any fixed position.

The S3004 are inexpensive servos, and would not be a rugged as the more precise/powerful servos. A 3D-type model would be harder on servos than a trainer or regular sport model because of the large control surfaces, and the higher level of activity of those control surfaces.