As others have said, binding in the nut is most likely the issue. Years ago when I had a Les Paul Studio it came with a cheap plastic nut and I had that same issue. I replaced that nut with a Graphtech black tusq xl nut and the problem went away. I have a zero glide nut on my current Les Paul and those work well too. If you want to keep the existing nut you can use some form of lubricant in the slots like nut sauce, Vaseline or even pencil lead will work.
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