I have a five piece maple neck on my '97 Epic. I have noticed in the last few months a ridged separation in the joint below the D string. It runs the length of the neck, disappearing just before the body joint and the head stock. It is tall enough to catch a fingernail on. It doesn't seem to affect playability. Should I be concerned and if so, what to do? I've had the Epic for 4 months, my first Alembic, and absolutely love it!