I have the same problem when I run 10 seconds. So what I did is took my sun visor and tucked it into the trim piece above the windshield and that holds it in place.
I've looked all over. I think when I did the last big garage cleanup I may have tossed them. I'll keep looking though. Garage gets pretty hot when it's over 100* outside. I still have to face that for another month here in Phoenix.