2002 A4 3.0 Quattero with manual transmission. After sitting overnight when I place the vehicle in reverse or adust the outside mirrors the parktronic beeps four times then stops, this only happens when it has been sitting for a period of time. I've checked the operation of the sensors and they are fine. Any suggestions on how to correct this latest quirk, the driver's mirror has never dimmed properly and will change position randomly. These two anomolies have been there since the vehicle was purchased new and the dealers were never able to fix them.