Game crashes after a while

Well i installed the game recently and im playing it without any mods, however after a little while game suddenly crashes without any error or reason. I've tried updating my graphic card drivers, changing the settings for graphic driver, changing in-game settings and all but it makes no difference. Also the weird thing is that it crashes in different times, i mean sometimes it crashes after 20 min sometime 5 min. Is there anything i can do to fix it?
 
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