I think you worry too much, this is normally a server error which does happen even to the likes of Google Adsense.
Yeah don't sweat it.. you will KNOW when you are banned.. it will come in a email before you ever get to login.. they like to lock you out first and then email you to let you know so that you have no chance to get at your data and verify anything they are claiming about your account.
Thanks for all positive and encouraging responses guys.. and you're right, apparently its caused by my slow internet connection. now its back to normal.
That's great that now its working fine . You know that their are so many account and servers get too much busy . So this is why we face sometime these problems .