Hey Bill,
I live in Illinois where we can get some pretty hot summers.
I had the adhesive come apart from the Magnetic base. I think the combination of the heat + weight of your phone, plus any herky-jerky taking the phone off the mount. I emailed @AnkerOfficial and their support team was super fast in sending me a new baggy of an adhesive mount and alcohol prep pad.
Make sure to clean the area well and/or put it in a new spot. I also recommend waiting at least 48 hours to let it cure. Now on super hot days, I try not to use it. knowing that it can very easily happen again. I would definitely recommend Anker use some strong 3M adhesives. Although they don’t want to ruin any surfaces that we apply the 3M tape.
Good luck!