KO 2365 clicking ?

[RDG 40]

Just a quick question someone may know.

Just got 2 servos back from repair, the 2365 clicks when not in use (just move wheels on car when not on) and still does now after repair

Is there a reason for this if so what is it. I know the servo is mint and in action it does not click im just curious as to why it does. The 2363 i have does not.

thanks

Russ