I was ranking for a really hard kw on position 4. - 5. since a year. The kw have 90.500 local searchs (exact). To got on that position I did lots of links, around 40% exact anchor, and 80% broad anchor. Then 2 weeks ago I lost the rankings for that url and that exactly kw (other kws on the same url didnt lost the rankings). First I thought about Penguin, so decided to wait for a week, I rewrote the content of the page and then I got the rankings back (without deleting any backlink!!!). Then I thought that the problem was just about kw density, and I was happy because I was back. And then after 4 days ranking as usual I lost again the rankings for that keyword. So I thought again that it was Penguin. Today after a week and still without removing any backlink or doing any onpage stuff, my site is back on position 4. for that kw. Any ideas of what could it be?