I would suggest the problem is that a major server/router on the internet is down just like part of a motorway network and is causing traffic jams and timeouts, as it is not Auctiva, affects various ISP's
Therefore an e-mail to your ISP's regarding service disruptions between your ISP's and Auctiva should be enquired about.
I have experienced this sort of thing a year ago and was able to confirm a problem elsewhere.
What about other websites in similar locations ?
Edited - correction as you all appear to be UK users