so i have a hitec 7940 servo that does throttle duties in my buggy. when the servo is powered on it works flawlessly, have not had a single problem, but when it is not powered on and i try to move the servo horn back and forth it does not move freely like it should. i know its not right cuz it didnt do that when it was new and my 7950 in steering moves back and forth freely. does this sound like the servo is going out?