My bluetooth headset volume controls have stopped working for music.

I have a Motorola S305 bluetooth headset that allows me to take both phone calls and listen to music. For some reason, the volume controls no longer work for music. They still work for call volume. The problem exists with both streaming music via Pandora and natively loaded music via the iPod App. I have the latest IOS 6.0.1 and all apps are up to date. I have tried repairing the devices with no success.