I'm French and I will try to be as clear as possible.
Everything was fine until this Monday when we lost many visitors. It seems that Google isn't indexing the posts on my blog (http://www.google.fr/search?q=site%3Achevaliersdesgrandsarrets.com). It only indexes my pages, categories and tags. So the site dropped from page 1 on Google for our popular search terms to page 20. We lost many visitors.
I don't understand why this happened. I didn't try to change anything. I haven't touch the settings for the blog for 3 months. Is WordPress.com aware of a problem like this for other blogs ?
The blog I need help with is chevaliersdesgrandsarrets.com.