Rickenbacker 4003 purchased last October - played like a dream until about a month ago when I started to get a bit of fret buzz. Opted to give it a full set-up with a new set of strings, but Ric strings are mission impossible in the UK (best offer I had was 6-8 weeks!) so I put a set of Ernie Balls on & set it up. No fret buzz and nice action, but when I pluck B on either the G or D strings the resonance dies almost immediately !! Any ideas anyone ?