heat certainly does. on mine, i've noticed that on hot days, the camera slides up off the mount a LOT easier (looser) than it does on cold days. it also picks up engine vibrations at particular RPMs on hot days, where on cold days, you don't get any engine/road noise at all. to fix that, i added a small piece of adhesive felt to the mount, to sort of pre-tension it, and eliminate vibrations in the videos.
Exactly! I have researched and found that camera is loose with windscreen holder. So, because of heat or something else, or plastic holder has become smaller or plastic housing of camera has become bigger 🙂