Arcturus DC when you have big amount of registrated users

My Hotel have more then 1000000 registrations. And thats a problem.

New users are disconnected when they put wall furnis in a room, it only works good when the id of user is low. For example: if your ID user is 1, you wont have any problem, but if it is 1530913, u will be disconnected everytime you put any wall furni.

Any help to fix that? Its not understandable...