Did your campaigns or some of your campaigns got hit by the Quality score? There have been many buzz lately on webmasters forums and found an extremely good thread in Webmaster world which I will post here some interesting replies and for sure will try to answer some of them and giving my own tips from my experience.

ou have to check if your adwords account have been hitted or your domain name have been hitted, how you can know this? just create a landing page similar to the landing page that you have and add some content (I prefer to make it unique) like 20 to 30 articles, then change the display URL and the Destination URL for the new domain name, wait a few days or a week and see if the quality score changes. If yes, then your domain name have been slapped and your account is fine, if your account have been penalized then try the following: