I'm not sure if this is the correct forum for this question so I apologize if it's not. My problem is that recently I've been getting some distortion coming through both my speakers and direct out (comes out the club PA) when I hit one fret in particular on my bass. That one fret happens to be the fifth fret on my E string (the A note). Basically, it's the classic fart sound that sounds like the speakers have crapped out. I know it's not a blown speaker or faulty bass head because it probably only happens a few times per show and sometimes not at all for a 2 hour gig. Also, I can play my open A string and it NEVER makes the sound. It's only this one fret that has this problem. This is the strangest thing I've ever seen. I have no clue as to what's going on here. I was thinking it could be how I have my action set up but I've had it set the same way for months and months. I don't see how it could be a faulty pickup or else it would happen on other notes right? Any help would be appreciated.