Here is what I have done so far:

* Lowered all graphic settings (game look really bad)
* Started running the game through a shortcut as administrator
* Closing all unecessary .exe files in task manager

I stopped using quicksave and only save manually (dont even know if there is any difference). Cant say it fixed the problem completely but I have fewer endless saving loops than before. I can play around 30-60 minutes without any save/load game freezes and before I could only play 5-10 minutes without saving/loading crashes. On the other hand itエs a 50/50 chance that the game stops working when I change zones so I avoid changing zones as often as possible.