As much as I hate to say it, Battlefield 4 is just not a well made game. As with many games that have loads of problems, it is likely a very good game at it's core, but it has so many problems both in single player and multiplayer that it's nearly unplayable. I could write a book about the problems with multiplayer and I could write a series of books detailing examples of when they have happened to me. As for the single player, I have gotten save files deleted and collectible dog tags/weapons also deleted during those saves which are supposed to save separately from the actual file. I get a type of lag sometimes in the single player which feels similar to the crappy servers in multiplayer. It really is a huge problem.