DICE Working on Fixing BF4 Progress Loss and More
Since Battlefield 4‘s release, bugs and crashes have been quite an issue for some players. There have been many reports of players’ multiplayer progress being lost, single player save files being corrupted and several crashes and freezes while playing. These issues are still under investigation by DICE, but they seem confident in resolving them in a timely fashion.
Meanwhile, it seems like several bugs, including audio glitchs and glitches involving reloading in singleplayer have been fixed and a patch should be released soon.
The whole list of known bugs and issues, as well as their status, can be found here.