I have a well established blog, top rankings in Google for my keyword. My site has been around right about a year. I was checking some of my blog posts yesterday to see rank position and noticed that nearly all the ones I checked have vanished. The content of each post is unique, and highly optimized (H1, H2, H3, etc). The only thing different thing I have been doing lately is pinging my Article Marketing Robot links (which link back to my posts.) The other thing is that I have been gaining in rank with my actual domain name for other keywords that I have been targeting. But my post rankings (which target different keywords) dropped off.
Can the Google dance happen at any time? Any ideas of why this is happening, or anyone going through anything similar? I only do 2-3 AMR postings a week so I am not blasting out thousands of articles each week. My traffic has dropped by over 50%. I check my stats daily and it seems it started happening yesterday, stats for all of last week were within normal range.