it is only your problem. Propably device is broken.
Was your camera fixed after you downgraded to A12?
How can I go back?
That site is an incomplete mess
I updated yesterday morning, had 8hrs and 5mins sot by 11pm last night. That was starting from about 830 am. I usually get about 7.5 hrs sot since being on beta firmware. No heat issues at all. Never did and I've had the device since day 1.