I just started having this issue today (10/25). Screen goes black after about 10 minutes and and I have to reboot the PC. I have a Radeon 5770, so I don’t think it is limited to Nvidia cards. I’ve been playing this game daily for 2 weeks with no issues until this morning, so it looks like something with the most recent patch. I haven’t updated any drivers recently.
I have another system with an Nvidia GeForce 9800M GTS that has no issues.