The problems I've had with a couple of older servos has been down to the latency speed of modern radios. They can't handle the speed the modern radios work at.
They were KO servos and would buzz loudly and start getting hot. Didn't have them sticking though so it may not be the same thing.
Are you able to alter the speed of your radio?
I use a Sanwa Exzes Z and you can adjust it, and that fixed the problem I had.
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