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In June our domain authority was at a 41. In July we were 38 and ever since then our domain authority is gradually getting worse and worse. We went from a 33 to a 29 in one week! Possible explanations include: Maybe the SEO we hired (for a few months in late 2011) added our domain to some less-than-awesome directories The 301 redirects on our home page are hurting us somehow Duplicate content for URL's with different capitalization (IE: /pages/aboutus and /Pages/AboutUs) Can someone please point me in the right direction? Which of the above possibilities would likely impact domain/page authority? Any other ideas as to why this might be happening? Any suggestions for improving our domain or page authority? Thanks for the help!