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Jorge, thanks for your question! You've received several solid responses. Did any of them answer your question?

Jorge- Can you check the age of the domain name?  I've seen instances where sites that have been alive for a long, long, long time can outshine other sites with better statistics, but they've withstood the test of time for Google.  That's one place I'd look to see if there is a substantial difference.

I agree with this. Seems like a penalty.

Just exactly what happened to me, I recently added new keywords and haven't been crawled by SEOMOZ bot.