I've had an odd thing happening with my Yamaha RBXA5. If my finger happens to touch the metal blade of the neck pickup, it emits a high pitched squealing sound. The bridge pickup doesn't do it nor do any of the pickups on my other basses, so I'm assuming that it's not normal at all. The effect seems to be less strong if I have my fingers on the strings. Could it be a grounding issue of some sort?