I have had 4 of these headsets. I returned the first three and now the fourth has started the very same problem as the first three. After using each headset several times, the "reduced volume" control will activate totally on it's own and take the volume down to it's lowest level, and the "increase volume" control will not function at all. This leaves you with a headset that only plays on it's lowest volume level.Motorola should be ashamed to put it's name on something like this!!!