Anyone else had this problem? ... what happens is the radio/cd will not respond to any of the steering controls or on the unit itself apart from the on/off button .. the only way to sort it out is to stop the car and remove the keys, using the radio on/off button has no effect, apart from turning it off

Also got a problem where I'll get a buzzing sound from the NSF door speaker .. it's definately linked to the music volume as it stops in between tracks on the cd or quiet moments on radio.

Both of these are intermittent the lockup has only happened a handful of times since I got the car about 20k ago but the buzzing is more frequent ... had local VX dealer check it at it's service but they found nothing