Bought a hitec 645mg servo for steering on my muggy a month ago, worked fine up until now, I installed everything for my new dx3s today with telemetry then tonight took the telemetry reciever out to put the regular spectrum reciever in and right away was having problems at first the reciever wouldn't turn on unless I un plugged the steering servo and finally I got it to come on with it plugged in but now the servo twitches BAD. If I let it centered it twitched but if I turn it either direction it will stop then when I let it center again it twitched. I plugged my old Jr servo in and it works fine.. is it the servo or what?

Should I only expect hitec servos to last a month? This servo has never been wet either.