I was at band practice a couple days and i plugged in my Yamaha RBX 750A which is an active bass into my amp and it was much quieter than usual...actually a little quieter than the drummers passive bass. I have changed the battery and still the same result...i have to run my bass into the non-padded input on my amp and still turn it up a little....is it possible that the electronics in my pick-up went out??? I'm not sure what would cause this, any suggestions???