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Over the past month and a half, our crawl stats have been rising violently. A few weeks ago, our crawl stats rose, such that the pages crawled per day worked out to the entire site being crawled 6 times a day, with a corresponding rise in KB downloaded per day. Last week, the crawl rate jumped again, such that the site is being crawled roughly 30x a day. I'm not seeing any chatter at there about an algorithm change, and I've checked and double-checked the site for signs of duplicate content, changes in our backlink profile, or anything else. We haven't seen appreciable changes in our search volume, either impressions or clicks. Any ideas what could be going on?