Probably lock your account and make ya change your password. I'm not sure exactly how they go about this, though, as I've literally logged onto the game for a year from the same console every time and I've had to change my password multiple times over 'suspicious activity'.

The conspiracy theorist in me thinks it's a ploy to sell more one time passwords. That or/and Elvis is trying to play my account from the moon. The world may never know.