My two month old bongo bass battery connections went bad, I took it to my local guy to fix it. It worked fine for a day, then when I started to get into a song and jump around a bit, it went out again. anyone know if this is a usual thing with these basses and how to fix it? P.S. on the bongo it's a slot deal where you just pop them in, not the caps where you peel the batteries on and off.