I'm having a very similar problem. I get to the character select screen, but when I try to enter the game after selecting a character, it first gives me a lobby error (10105 if I'm not mistaken) and throws me back to the main menu. After which, it either fails to load when I try to enter the game or lets me get to character select again, but in either case it gives me error 2002 and closes altogether. This has been happening since the maintenance yesterday.