I think there is a server side issue that when someone get dc, it still logged as connected and not releasing the spot.
I tried log in few hour ago and got dc. when I try again 3 hours later it says I have already log in. for those who got random DC , if you don't log back in right away, the server still think you are logged and taking up the spot.
also @Juji please look at what those boxes are doing on certain profitable quest and disable them! that's what they are aiming for and took up the valuable seats and the real live player can't log in. usually when this happen when someone found an exploit and abuse it for adena!!