Save file on PS4 might be corrupted. Don't have any idea how it happened, but when you play for 30 min to couple of hours, game freezes, screen goes blue and error code CE-34878-0 comes up. Everything you've done before the last autosave is lost.

This is a very big and frustrating problem and you need to fix it. I don't want to pay for a game, play it for many hours and then this is the price.