What I noticed that before a crash, something weird can be seen on screen like, corrupted fonts of objects, rainbow colored objects or monotone colored objects, misplaced smoke, flying stones, and other really weird graphical glitch.
If I go back to an older save, manual save I can play for more than 30 minutes but after I see those weird things again its sure to crash after a few seconds.
I think the crash is still attributed to corrupted saves.