Although the error is not new, more and more PS4 users are complaining about its appearance which renders save files corrupt and some games unplayable. Sony investigates. Follow the link for more.

http://www.computerandvideogames.com/446116/ps4-users-report-save-corruption-errors/

[UPDATE]

A hardware issue it is. Thankfully a solution has been found.

http://www.gamrreview.com/news/90937/sony-offer-fix-for-game-breaking-bug/

I hope I don't encounter that error during Infamous. (I already beat Assassin Creed, and might start killzone)

In the link you can find some guidelines to deal with it, should you encounter it. Which I hope you don't.

I am pretty sure it is on a very small scale at this point, but I do hope regardless of the scale, sony does deal with it.

And this is why I always update my save files to the online storage ever several days as I've been a victim of corrupt save files in the past.

Well this sucks but it's kinda the game's fault for crashing. That's why I only knew this error in connection with BF4.

Another reason not to buy a console at launch.

There are pictures that show BF4 saves, but the link states that more games present problems regarding this error.

this seem like a software problem

I lost a save with BF4 back in November, luckly I was not to far along... I think I had beaten 3 missions at that point.