Well it happened again and this time I went downstairs and tried it on a different computer, same problem.
I'll go through opendns.com and see if I can find something there to help....
UPDATE: Ok I installed opendns and the site started working again. Whether or not opendns was the cause I won't know until it either keeps working without problem for the rest of the week, or it goes down again for me!
Either way THANKS LISA!