backdraft7 - 6:00 pm on Dec 28, 2012 (gmt 0)

I got the same message a day earlier, however I had a valid reason - my hosting company recently moved my server and changed all my IP's, then I had done a trial of a CDN that require a nameserver change, I wasn't thrilled then switched back, so another nameserver change - 3 in one month, so Google spanked me hard! Traffic came back up on the 26th, but historically, that is expected in my niche.