My Dean 5 string acoustic would get some rattle (B string 5th fret, and E string 5th, 6th, and seventh) when I was using bronze strings along with temp. and humidity changes it would need a slight truss rod tweek would be necessary to keep it at bay every, about every 6 months or so. The root problem I found was that the PO had round wound strings on it and they ate their way into the nut. Now, with tape wound strings and increased diameter most of my problems are solved (increased dia. keeps the strings higher in the nut, above the sharp point of the grove in the nut) but, if I go back to the original bronze strings I think I would have to replace the nut. Larger diameter bronze wound strings like round wound strings are a lot like taking a round file in the grove if the nut is soft material.