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I read about "Fred" since Moz mentioned it in their newsletter yesterday. Two interesting links: https://www.buzzfeed.com/leticiamiranda/overstockcoms-search-engine-business-is-crumbling-after  https://www.searchenginejournal.com/google-algorithm-history/fred-update/  I guess this sounds familiar and aligns with the period that my client suffered. I don't remember ever reading anything about it, but it might help.