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I have the same box and had the same thing happen on humid days. If I put just a touch of pressure to keep the paddle from contacting the screw head it went away but wasn't sure how to correct it, until now. I'll be trying bowstring wax on it, thanks for the tip!
I've sprayed graphite lube in a paper cup then used a q tip to place a drop down the screw hole. If in facts it's the screw. Worked on a few boxes that I've had squeak coming from the screw.