Two weeks ago we uploaded a new set of pages to our site. At the time the site was high-ranking (top 4 or 5 results) for many relevant keywords and doing very well with Google search traffic.
A week and a half ago, our traffic suddenly took a nosedive. I haven't been able to figure out why. I made some tweaks to the new pages, but they aren't duplicating existing content and there don't seem to be any problems (such as broken links) with them, so I can't imagine why adding them would kill our traffic. I redid our sitemap, since it was somewhat out of date, and I deindexed some low-content pages, but nothing seems to have budged the traffic. How can I figure out what happened and fix it? I know that traffic fluctuates normally, but losing 30% in one day seems pretty drastic.