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I've really been scratching my head on this one because I do nothing that I consider questionable in terms of SEO practices. Also, I have a small network of related websites but only these two sites have been effected. Even though all of the sites in my network are similar in design and SEO practices.
Earlier today I discovered something that feels like it must be a clue but I'm unsure what to make of it. For my other sites, which haven't suffered a drop in rankings, doing a link:www.domain.com results the exact same results as doing link:domain.com. On the two affected sites link:www.domain.com returns a few results but link:domain.com returns nothing at all!
Anybody got any ideas as to what this could signify?