Why do you keep disconnecting when you log on to Maplestory?

It depends on how fast your computer is and Ram. If that's not it, then you might have too many programs open. (Ctrl + Alt then Del and open a Windows Task Manager). --> Then click Process and look for any suspicious things that are open. If all else fails try not moving the mouse a lot when opening Maple story. I think its from the new Big Bang patch with all the requirements they take on your computer now.