i came home from a week in florida and found my WRX, parked at the airport had a cracked side mirror. First thing i suspected was someone got their suitcase out of their car and hit my car, but i inspected my door and mirror closely and couldn't find any dents, smudges or anything to indcate that something came into contact /w my mirror. After i touched the mirror i noticed a drop of water came out. Now i'm wonder if water got behind it, froze and expended, cracking it. Has anyone run into this?