Other than the homepage, the post that has gotten the most traffic on my blog Tuned In To Music (a review of a Donna Summer greatest hits compilation - surprised me too) has been hit about 13,500 times since it went up three years ago. It usually gets hit somewhere between 15 and 30 times a day, every day without fail. For the past three days (including today) it has not been hit once. During that time "donna summer" shows up in the list of search terms users used to get to the blog but the post shows no hits (there are no other Donna Summers reviews on the site). The post with the second highest traffic rate (a review of an album by Metric) has received about 11,000 hits and it also has received no hits in the past three days. Both posts can be accessed normally via a search on the blog - in other words, they're both still there.
Both of these posts received many more hits than anything else in the blog except the home page; the post with the third most traffic has about 4,000 hits. Hits on everything else on the site appears to be functioning normally in that the daily hit totals are about what would be expected with hits on the Summer and Metric posts removed.
An occasional day with no hits wouldn't be cause for concern. However, a period of about 60 hours with no hits on the two posts on the blog which have consistently received the most hits on a daily basis over the past three years by a very large margin combined with what appears to be normal traffic for everything else on the site doesn't look like coincidence.
Does anyone know what might be going on here? Has WordPress changed the way it logs hits? Might the blog be bugged?