So, I was working a gig Saturday and my MIA Deluxe Precision which always sounds great started to have a problem in the second set. started fuzzing out a bit. I heard ot thru my amp and gui**** heard it thru IEM. First thought speaker. nope working fine. then thought wireless and pedals. nope, unhooked them all and went to bass > cable> amp. Thought maybe amp. nope, went straight into board. thought battery issue as the bass requires 2 9v. nope, tested both on break. fine. the only thing i could figure was the mid sweep knob. it was coming loose during the second and third set. for some reason i can't the set screw to bite tight on the shaft of the pot. anyway, before the fourth set, i was able to really tighten it the best i could and had no problems with the noise during the last set. I am guessing that since the knob is metal, there is some weird grounding occurring. Any ideas would be appreciated.