One of my post about Avast 4.8 has been on rank 3 on Google's SERP whenever you type keywords of "avast 4.8". After the last update, however, it went to never never land, never be found again. If you use the site:michaelaulia.com command, you can still see it though, so it is still indexed. Somehow the rank went unranked so I assume this was the culprit why it wasn't on the first page anymore?
It's difficult to determine why your site no longer appears in the 3rd position because google does weird things to your serps when their algorithm changes.