sitemaps crawling schedule

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Sitemaps crawling schedule has changed. In March every sitemap on my sites  
was fetched twice a day (sometimes even more). Since about April 4th  
sitemaps are crawled less frequently - on ph-meter it was last fetched on  
7th, on chembuddy it had some hiccup till 16th (0, 0, 2, 0, 1, 0, 4, 3)  
but it is once a day since, on bpp it is identical with the ph-meter (not  
fetched since 7th).

The only thing ph-meter and bpp have in common is scandalously low PR3.


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