Hello Tokki,
What you need is a new sticker. Once a sticker loses its adhesive powers, it is no longer any good.
When you set up the camera with the new sticker. Try cleaning the windshield with rubbing alcohol first to ensure a good clean surface for the sticker to stick to.
Thanks Tabetha.As above, recently here in the uk it hit 35c for over a week and my cam is stuck solid, I cleaned glass with isopropyl alcohol let dry stuck on and it stayed no problem.
I had mine installed in Albuquerque where I never had any issues with it falling off due to heat. There were adhesives in the box for different kinds of weather and I used the high heat one.
Thanks Phil.Use isopropyl alcohol as it is a more pure product which evaporates more completely with less residue Ordinary rubbing alcTohol can be as much as 30% water
Phil