Hello All, I have a '03 A4, when I unlock the doors by pressing the unlock button on the keyfob I sometimes observe that some doors do not open so I have to pressing the button a second time, does anyone know why? Is the locking mechanism aging? My key fob also has a button to unlock the boot but has never worked but before I go out and invest/buy in a new key, what exactly does this button do? When operated does the boot literally opens itself? Many thanks.