I have an Astra G with the audio controls on the steering wheel. A year or two ago I replaced the standard radio with a pioneer unit and installed the required adaptors so the controls worked with it.
Today I find that the volume controls on the right of the wheel now behave strangely; the mute button is fine but the volume up button occasionally mutes the sound and the volume down button either turns the volume up or does nothing. This started out of the blue during my drive home.
I'm thinking it could be the controls or the adaptor unit has started playing up.
Has anyone else experienced this?