When you buy an instrument you have to "tune" it, fix little problems.... The fret becomes a little "used"(sorry, i don´t know the words in english...) while you play and this situation causes milimetric diferences between the frets...(are you understanding what i´m saying?) this diference is one of the many things that is probably causing the note die. Hope it helps.
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HTF ( prog_jam@yahoo.com.br )
HTF ( prog_jam@yahoo.com.br )