I recently picked up a used 2001-2002 era MIM Jazz Deluxe in somewhat poor condition and have been working on it. The only problem I'm having is with the tone. It seemed fine (great, actually) for a day or two but now there is a definite inconsistency that sounds like a light phase shift. I'd say the modulation rate is a few times per second. It seems more pronounced on certain notes but sometimes barely noticeable. Doesn't seem to matter where the pan knob is set at (neck or bridge pup). Strings are brand new and the battery is fine (I replaced it). I think this bass has the Suhr pups. I've done some searching and found nothing about this kind of issue. I have very limited electrical knowledge but can do basic soldering. Before I take this to a shop does anyone have advice on what to look for? Thanks in advance for any help you might be able to offer.