A situation like this occurred almost three years ago. It had nothing to do with sites like auctiva ebay etc. two major servers got into an issue over the other using there bandwith or something like that and the server pulled back . This effected many people all over eBay and major web hosting sites. Grrr now I have no excuse to not vacuum this afternoon and get everyones laundry done here until the picture situation is fixed.
Could also be something simple like a slight change in eBay software that Auctiva has to conform to in order for the software to be back up and running.
Good luck everyone and Thank You Auctiva people I know you will get it worked out again.