Hi.... I need help. I've tried everything I can think of. I have a Fender PJ Bass. I get a buzz, ring, overtone, harmonic tone type of sound when I play an open A string and also on the 12th fret of the A string. The overtone/ring sustains for several seconds until it decays. Problem is loud on the P pickup, a lot less with the J pickup. There is no problem with any other string. Here's what I've tried to resolve the problem with no luck. 1. Change strings. 2. Check neck relief 3. Check nut height & clearance 4. Check bridge height and radius 5. Check pickup height 6. Verify intonation 7. Check nut and saddle grove to see if it's too tight or loose. Then I started trying out of left field stuff: 8. Change cord 9. Try a different amp 10. Changed out both pickups 11. Tried a larger gauge A string I am flat out of ideas. The bass is about 8 months old and this wasn't a problem until recently. I'm in Southern California so I don't think there's a humidity or extreme temperatute environmnet. I'd appreciate any thought and suggestions.