Google announced quietly on Google+ that they are going to be making the Dynamic Search Ads feature in AdWords more relevant. How so?
Well Google wrote:
Over the next several months, we’re rolling out improvements to DSA campaigns to ensure your ads show for more relevant searches and result in better performance. For example, ads that point to a landing page about iced coffee makers will be less likely to show for less relevant searches like "iced coffee."
I guess this will be tweaked over the next several months and you should take notice when you use DSA for your campaigns within Google AdWords.
Google added that "you may see fluctuations in performance" with your DSA ads and they "recommend monitoring your DSA campaigns using the search terms report."
Forum discussion at Google+.