I've been enjoying my new Sadowsky Metro, but I've noticed that there's fret buzz on the D string below the 7th fret, even if the string is open there's a light drag that makes it a little lower output than the other strings. It sounds like the note is "choked" a little causing less clean vibration. I've also noticed that if I fret the 7th fret of the E and the 7th fret of the G, the notes choke if I play the two strings at the same time. 7th E / 8th G works, though. I've got the strings 5/32 off the last fret on the E and A, 4/32 on the D and G. Is this a job for the truss rod? The bass came to super humid south Louisiana from NYC, so I'm guessing it's going to be something to do with that.