NeoGAF user Dragon1893 reported on a devilish bug in The Last of Us that causes players to lose sometimes hours of progress. Naughty Dog has since fixed the problem, it announced on Twitter.
The game’s autosave feature quit working and got stuck on “autosaving, please wait” when trying to access the menu, forcing players to restart the game.
The solution was to play the game offline, but Naughty Dog has fixed the problem. According to its Tweet it was something screwy with the servers on its end.
Source: NeoGAF user Dragon1893, Twitter