Yeah once they start to go flaky it's best to just bite the bullet and replace the socket with a new one.
It's not that the new sockets are of any better quality than the originals though. They are just "new".
After 40 years the cheap plating on the sockets tarnishes, the conductivity starts to fade and they become unreliable. Sure there are a few rigs you can do to squeeze a little more life out of the crappy old sockets but it's short-lived and unreliable.