I am having an issue in which the game crashes after about 5 minutes of play. Have started 3-4 or times with this being a consistent issue. Slightly older setup, so that may be part of the problem, but this feels like a pretty low-taxing game even for my old system.
Can you please email me specs of both machines (including operating system, video card and video driver versions) and a copy of the game log (from a play session where it has crashed!) to the address under the "Technical help" section here on the store page?
Autosaves are meant to happen every 10 minutes. If it's crashing after 5, I suspect it might be something else - I'll know more once I see a log :)