Like most online games, Battlefield 4 on PC is having some teething problems. While they're not as severe as certain other games have experienced this year, they're still a pain in the butt for those affected.
Things like server crashes, long queues, loss of player progression and in-game bugs are making some people's experience with the big shooter less than ideal, but hey, on the bright side at least developers DICE are being up-front and helpful with advice on fixes.
This post on the game's forums is cataloguing everything that's popping up, and providing estimates and reports on progress being made to fix it.
If you're one of those suffering from problems, might be a good idea to bookmark it.