hey all

having trouble with my servos. i have a futaba MJ control unit and GWS servo S06/2BBMG ( hi torque ) . the problem is its going nuts . it malfunctions, revs by its self after turning and then just shuts down in full lock, ie wont respond till i turn it off and on again. its really strange because it happened gradually over a couple of weeks.
A what could be the problem? do i need to fine tune the unit or
B should i just get a whole new radio?
C what is a good reliable radio? ( money not a problem )