I just bought a B60R (dated from 1997) and for some reason, the remote, even without touching, will by itself raise the volume to the highest level. None of the buttons on the remote seems to work. If I remove the battery from the remote, the unit function as normal and the volume doesn't change. Once I put the battery in to the remote, the volume on the unit raises by itself without touching the volume knob or the remote control. What's the problem?