I have a twenty year old Fender Jazz bass with a dead third fret on the E string. I had read about this type of thing, but had not experienced it before until now. I never noticed it until yesterday. I had left the bass in a gig bag for a few months and decided to take it out to play. What causes this? Is there anything I can do about it? Could it possibly be string-related? This is very disappointing because I really like the neck on that bass, but I'm not sure I would (or could) play it like this.