I've got a G&L ASAT with the big MFD's that I don't play a lot. I took it out this weekend and noticed some extra high pitched hum/electrical noise in the middle position, but only barely noticeable in the neck or bridge position. I touch the strings and it goes away. I roll off the highs with the tone control and it goes away. I assume I have a ground problem but it seems strange that its more pronounced in the middle position (usually hum cancelling). Is that a sign of a particular problem? Any thoughts?