I picked up a used 2004 R7 over the weekend. I had one once before and it was an 'OK' guitar, but this one really rings like a bell and plays a lot nicer. The price was halfway decent and I was able to play it in person so I snagged it. I played the guitar for two days straight and finally noticed something. The 'G' octave on the low E string (15th fret) is dead. It just kind of makes a metallic plinky sound on that one note. I must rarely play that particular fret, but it caused me some concern so I checked every other note and the rest were fine. The ones on either side of it buzz a little but they're OK. Do I need a fret filed? Could this be a bigger issue? Neck appears straight, but I'm no expert.