Im having trouble with my new hitec digital coreless servo. Im using it with my old Ko Propo EX5 radio and the servo doesn't want to return to neutral position. All my old servos work fine any suggestion would be appreciated.

The radio is about 13 years old and I love the feel in my hand so I want to keep the TX if i can but standard servos suck arse so im in a dilemmer.

All advice is appreciated

Gary