How do you know without seeing the guitar? Lol. I had a Graph Tech nut do the same exact thing and it was brand new out of the package. How do I know it was the nut? It didn't do it with the stock nut and it didn't do it anymore after I fixed the b&e slots. You can't assume someone else's guitar has a problem based on a single experience of yours without ever seeing, hearing, or touching the guitar. And then tell him that he's wrong. That's just crazy.