am building a ts2. airtronics receiver & th. servo. steering servo is t. hobbies hi torque # ts64. st. servo hums, causing th. servo to twitch. disc. st. servo, th. servo quits twitching. t. hobb. said hi torque servoes do this sometimes. tried other new one away from th. servo, same thing. th.& steering work o.k., just acts up sitting still. help me out fellas. CARTER