Mirror folds up in high winds: solved (but not pretty)

When I park in public parking lots, I always fold my mirrors in to avoid having some inconsiderate person walking past my truck and banging into the mirrors. I would rather fold them in than have them broken. I had to fold my mirrors in many times on ferries, parking lots, drive thrus, banks, or driving through the woods.

I have never had my mirrors move on their own even when driving into heavy winds going across the Dakotas. I drive a 2011 F150.