I've come across a problem regarding my selector switch. Well whenever I move the blade to the neck position (humbucker) it sort of makes this crackly sound and mutes the volume on my guitar (sometimes makes the sound barely audible). I have to fiddle with it a bit such as pushing it back and forth to make the neck pickup work. The middle position is fine, but whenever I move it to the neck, it just doesn't respond too well and I have to keeping switching back and forth until it gets working. Same thing when I move it back to the bridge pickup position as well. Anybody know whats the cause of this?