Have you seen error CE-34878-0?
There are reports of PlayStation 4 users encountering error code CE-34878-0, which signifies that an application has crashed, across multiple games including Battlefield 4, FIFA 14, and Resogun. Some of these crashes have resulted in the corruption of save files and unplayable software.
In a statement to CVG, Sony said "We are aware of the cases and we appreciate your patience while we investigate." From the sound of it, the issue may be hard to track down since this is a generic error for any crash on the system. The crashes may be specific to each individual game.
According to Sony, users should "Close the application, install the latest system software and game update, and restart the system. If the error occurs again, back up your saved data, and then go to [Settings] > [Initialization] and choose [Initialize PS4]."