My P-Bass' A string rubs up against the bottom pickup for some reason and I'm not sure how to make it so it doesn't do that because the note doesn't really sound out and when I go past fret 6 it doesn't make much of a note worthy noise at all. I tried taking a screwdriving and tightening and loosening the screw on the bridge but it didn't help much. Any suggestions?
you can adjust the pickup height.

above and below the pickup there should be a screw. turn each one anti clock-wise a half turn and give it a try. if it still hits then another half turn. if this doesnt sort it out you may need to take it to a tech for a set up.
Thank you please.