The passenger side exterior mirror goes crazy after a rain or car wash. Most times it forgets its memory setting and the glass droops to the full down position when the car is turned off. When I restart the car it doesn't return to the correct position. After a hard rain last week it went totally crazy - sometimes it would go to full up other times full down. When I would press the memory button the mirror would start moving all over the place - up, down, left, right. I would have to hit the memory button 5 or 6 times to get to the right position. Of course it stopped the day before I took it to the dealer and they can't repeat it. Anybody else experience this?