I was lucky enough to get a new Stingray 3EQ this week - great bass! Most of the time there is no noise at all, but when I rub my finger gently across the pickguard/scratchplate I get a weird crackling noise. It only happens on the pickguard and none of my other basses have this problem. It's not a major thing, but it can be just heard when changing right hand position during playing. Anybody else had this or got any clue to the cause?