Crash at the end of a multiplayer game is back.

I have been having issues leveling up. I would level up and then the next game it would take me back down to the previous level. So actually I would have to level up 2 or 3 times before it would actually keep me at the level. Now I am level 59 and everytime I am supposed to level up to 60 the game freezes and I get an error message. This is really frustrating.