My above mentioned bass is having an issue with the pickups. It is a P/J type bass, and it's the P bass pickups that are the issue. They crackle when I play. I didn't notice this until I did a series of outdoor shows 2 years ago during Halloween season at a haunted house. I know it's not the height of the pickup because i had it low, then raised it, and it did it in both positions. Could the pickup have gone bad from moisture getting in it?