Could be behind the centre console i guess, probably worth a look if your sure its not at the other end, i would be fairly sure it is just a loose connection at one end or another. Mine was quite sensitive for a while and would always show error when driving, i unplugged it, gave the connection a quick clean and stuck it back in, good as ever since! I hope for your sake it is just the connection mate! does the changer actually get any power?