My podcast feed won't update anymore

My podcast https://itunes.apple.com/br/podcast/cafe-brasil-podcast/id191182582?mt=2 don't get update since last episode. Take a look on my rss http://portalcafebrasil.com.br/podcast.xml

I have the #448 episode published but it doesn't in the iTunes. I already validate the XML and all is fine. Another test i have made was open iTunes, and use the option in menu "Open stream". I paste the url for XML and all works fine.