I think this is a "Soft Banned" done by Square Enix. Screw them !!! this happened when I got suspended for 3 days. Then once they unsuspended it the account character frozed. They are forcing you to start all over with a new character.
Why I know ? I went to install brand new software on brand new computer and the same thing happened again. This particular character just frozed. So it is the server side issue. Since my dad is a lawyer, I am going to steal one of his company letter head and wrote to their CEO for they themselves don't play by the contract.