The 'classic' eratic volume problem on Concert A3/A4s... once you've got the disease, does it get any worse? Mine only does it for the first few twiddles when its cold, and thats it. I'd like to know before I decide whether to get a bootchanger or replace the Head Unit. Desperately want to keep the headunit, why are all aftermarket headunits so horribly designed?? They all seem to be designed for 14 year olds...