Had a problem develop this evening. When the car is off the steering feels fine. Wheels turn left and right no problem. When I put it on I can only turn left but it will not return itself. Nothing happens when I try to turn right and when I try to force the wheels by hand it feels like and sounds like the servo is fighting against it. But then I power off the car its movable by hand. Any advice? Car was running fine before hand and only stopped to swap out battery. Servo sounds good.