I have an Acer VN7-791g that will randomly shut down anywhere from 5 minutes to an hour. I've tested everything I can think of and think I may have a bad motherboard at this point. I've reinstalled windows, replaced ram and hard drive. It does this with or without the charger connected. I dont believe its heat related, it will shut down when sitting on the desktop. I've also ran cpu and gpu benchmarks and the cpu temp will spike to around 93c but doesnt shut down. I dont get any windows errors or logs, the computer just instantly powers off to a black screen. Event viewer just shows an unexpected shut down.