backdraft7 - 12:30 pm on Apr 12, 2013 (gmt 0)
I think I may have found one possible answer to the problems many are seeing. I opened a support ticket to my host and they finally replied today (usually they rely n a few minutes, but in the last week it's become days). There appears to be a severe, ongoing, global WordPress brute force flood happening that is affecting "virtually every web host in existence". This would surely explain the odd traffic patterns!
Read about it here: [blog.hostgator.com...]
Then change your WP password and clean up any outdated versions & plugins.
THIS is why I don't reply on Wordpress for my main business site (but I have many installs on my server and I use it for my main business blog)