Just one character or all characters? One server or on all servers?
There are times when zones go down and and your character is left in limbo. If you can log on to another character on the same server, do so, then petition it making sure to name your character that is inaccessible. A GM will have to move him/her/it.
Game freezes when i go to log a character in?
It doesn't cost a lot to be nice and reply to tells