I have been having problems with my X9E aileron control. When operating the ailerons, they sometimes are very slow moving, don't go to their full throw setting, and don't always return to center. This has happened on three different aircraft with multiple receivers. This issue probably caused one of my planes to auger into the ground. Switched over to my X9D Plus and the ailerons worked properly on one of my planes; battery went Tango Uniform on the X9D so I had to order a new one, so I couldn't check the other airplanes. Any ideas?