Is it the same user each time or a different one?
While the server may be huge, it's possible there's some sort of hard limit on the space your site can use. Usually can been seen if you are bumping up against the limit in the site's control panel.
BTW, "thanks for the reply" goes a long ways as well - attitude gets old too <img src="https://www.ubbcentral.com/boards/images/graemlins/wink.gif" alt="" />
