Been having this problem since the Alpha. When the game is loading a map for multiplayer it crashes most of the time. Usually its at 99% sometimes its a bit before. Had the same problem in the beta. I really don't think its my setup. I have no problems with any other multiplayer games. I can play Crysis 2 fine. I have port forwarded and that's done nothing. I have put my ip in the DMZ and still crashes.
Sometimes when i reboot I can get into a match other times it just keeps on crashing. I played single player fine with no issues. I certainly got a new video card. Went from a 570 to 7950 and it still crashes.