The game crashes on autosavings and when i reopen the world

The game works normal and don`t lag but it crashes on autosavings interesting fact is that the game don`t crash first two game days but when the game was saving to start the third day the game has crashed. I turned on game again and when i was reopening the world the game crashed i started to doing this the second time the world i opened normal and the game started from second day (which is normal when the game crashes) i have survived to the third day again and when autosaving have started again to start the third day the game crashes and have showed me a message that i haven`t have enought memory but in system requirements is that i need minimum 1 gb of memory to play the DLC but i have 2 gb of memory and this is strange. Please fix this.Sorry for my poor English