Googlebot Slow Crawling The Web From November 11 - November 17?

Olivier Papon from Seolyzer, a log analysis toolset, reported the other week that Google seemed to slow or stop crawling most of the web between around November 11 and November 17th. I did ask Google about this but have yet to hear back. It seems Googlebot is back at the crawling business now but we are not sure what went wrong or if something did go wrong....