The major cause of this is hording. If you have a large number of items (30 - 40 items total) in one location (one room, one bag, one pack), the game may corrupt some of your objects.
I personally always keep my bags tidy, with none of them holding more than 8 items. For example a backpack with 7 items and one chest, inside the chest I put another 7 items and so on.
The solution is, that objects are stored in memory one after the other. If the inventory of one item gets too big, it overwrites the memory of the beginning of the next item.
You can continue to play the game without re-starting, but you may not be able to finish the game if a quest item is corrupted.
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