I recently got a bass that has a single EMG-HZ pickup on it that's wired to be active or passive with EMG controls. When I first got the bass, everything worked fine, but a couple days ago the active mode stopped working. I swapped out the battery (the original is still good,though), and active mode was working again. I picked up the bass a little while later that day, though, and it wasn't working again. Passive mode still works. Electronics aren't my forte, but I'm really at a loss about what could cause this. Everything seems to be connected fine (no loose wires and everything's attached well on the preamp circuit board). I also treat this bass like my baby, so it's not like I'm rocking out and shaking up everything in the control cavity. In an effort to conserve battery power, I always unplug the bass and switch it to passive before putting it away. Does anyone have any idea what the problem might be (or any techs in the Philly area that'd be willing to take a look at it)? I'll try to get a camera and post some pictures of the wiring later today.