Question for the wise men... The E string on my bass is a bit unusual. The pitch will start a few cents flat fro a second or so, then suddenly jump to a few cents sharp for a second or so, then jump back to a few cents flat. This is easiest to note on a needle tuner. Basically it flips back and forth between flat and sharp, but again only by a slight amount. However this makes it difficult to intonate and tune. It's not like a chorus effect but rather like a switch is being flipped and then flipped once again. This is a Fender Geddy Lee with Badass II. Any ideas what is going on? Bridge, neck, string problem?