the server is still trying to interact with the client. something like a auto reconnect while you are online. after a set amount of reconnects fail the server then says. oh they actually are offline. time to remove the character from server side. it also stops from character data loss. with FF14 sending and receiving character data every 15 seconds so it does not corrupt is one of the many implementations to save it. yes. the 3012 error is annoying especially in mid fight.