Game freezes and sometimes crash if you set a lot of work for dups at same time.
After some tests, i realize that it happens if I do a non stop run(don't close or reload the game - 3 - 4 hours aprox.). If i close the game and reload, this issue is fixed by himself...
Specs: Win7 x64, GTX 660TI and 8Gb Ram
Edit: Seems to be the same issue as related in this post "High Memory Utilization". He explain it better, Mod can close this one or link that ~~
If you reach cycle 40 or above and just set dups to dig a large area or schedule a lot of things at same time(like build, harvest and dig, the game will start to freeze from time to time.