1) Is this happening to several people or just you as far as you know?
2) What web browser are you and the others using?
3) Does this usually happen at a certain time of the day?
4) When this happens do you / others have any problems going to other sites on the internet?
The answers to these questions would help diagnose your problem much better to determine if it is a server issue or connection issue on your personal end or the server side.