I am not sure that this goes here (mods-if not please put it where it belongs).... This morning I put a new 9v battery into my TRB5 and went to rehearsal. The first hour was fine. Then the volume shut down to a whisper. I tapped (not so lightly) on the back of the bass and the sound came back. Several of these incidents later and the sound did not come back. This is the first issue TRB5. Ideas? I am not sure where to get the battery compartment, or one that will work with the bass. I love this bass and its tones. Suggestions...???