Google has recently updated the accuracy of their international targeting tool in Google Webmaster Tools. Not many webmasters may have noticed this quiet update because international targeting is still fairly new, released in July of this year.
International and language targeting (href language tags) are a great way for businesses to target the multiple countries and languages of their customers, especially if you have different versions of your website. For example an English, Spanish, or Chinese version.
If you use hreflang tags, you may have noticed a spike in errors. There is no need to worry.