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One of the wrong times is buy domains in the belief they will keep they old pagerank.
Most expired domains are updated shortly after and go to zero. Others fail when not expired but the old owner used to update the content and promote, and the new one no.
Googlebot is not a single "individual", Google has about 700 datacenters so the robot which crawl sitemaps could not be the same you are seeing, as it is not either that which is called after placing adsense.
Try resubmitting you sitemap fixing the peiorical visit, or using another software to improve performance and frequency.
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