Hi! Sorry to hear that you're experiencing problems. Can you please send me your system specs and a copy of your game log (from a play session where it has crashed!) to the address under the "Technical help" section here on the store page?
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 :)