Hello keith, i had this problem once before on my first hero 3 BE. i eventually had to send it in to repair for overheating. But, once thing that seemed to work for a little bit, i put it in dry rice, in the freezer for a couple days, only meant to be overnight but i got distracted. i also used Wasabi brand batteries and that may have been an issue as well, i never had any luck with gopro batteries before.