It could be that the frets are not "seating" properly. If the edges of the fretboard come to a sharp point or are not beveled, sometimes it is difficult for the fret to lie flat along the edge. This is especially a problem with the larger frets one might use near the nut. The problem is magnified here by the stiffness of the larger-diameter fret gut, and by the difficulty in tying a really tight fret knot for the first two frets. The result is that the fret is not flush at the edges. One can often actually see the gap by closely inspecting the fret. One solution is to have a luthier round the edges a bit, as I had done once. One can also "kink" the fret gut with the fingernail to loosen it up at the points where it will contact the edges. Cheers, Jim
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