Daughters 2003 volume control will often not respond when turning up or down but will stay at the same level. I've had it happen to me as well so I know what she means. Today she told me her AC does not turn off when 'off' is pushed the first time but takes several pushes for a response.(This is the all electronic auto temp system and gives no other problems.) CD player and changer and radio work fine. I'm wondering if there is some mild corrosion at a contact point or in a plug connection and therefore thought some contact cleaner could be used. I can also get another good JY unit to replace mine. But before I start tearing into and spending unnecessarily does someone have an educated suggestion?