This has happened twice with two different timed missions, both from contacts in Skyway City. I receive a timed mission ("Recover the scroll of the Spirit Dragon from the Tsoo" from Cho Ge, and "Destroy the Portal" from Kong Bao). I go to the mission door and enter. I get to the loading screen, but then the whole game closes. Launcher remains. If I log back in, it still closes when I attempt to enter again.