Could it be a grounding issue? Have you tried touching the control plate and then with your finger still on the plate manipulate the control knob?
If you get a pop when you touch the control plate then it's a ground issue most likely. If the pot still pops then it could be an issue with the pot itself. Check the solder connection and make sure they are fluid and not cold. If one of the solder connections looks dull and gray then it might be a cold solder joint.
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