Ideas
I'm having this same issue. It's so frustrating. The only difference it's that i have a Nvidia GPU. I bought the game almost 2 months ago, and still didn't manage to enjoy it. Lost 4 saves due to corruption files. This week i tried the last thing. Reinstalled windows from scratch, and didn't install any third party software. Launch the game with good hopes. Played like 20 mins, than hard reset again. Only happens on F1. I had lots of other games that drawn 100% from CPU and GPU and never had my pc to shut down/restart. Already left my pc running with afk games launched for more than a week without having heat/power issues. Don't think it's a hardware issue.
Sorry for my English and for not having a answer. I'm writing here because i want you to know that you are not alone in this matter, and i already search for answers and only found older posts. Since this one it's very recent, I'm hoping we find a solution, because i really like the game, and wish to complete the game career without having to restart.