In order to maintain ad serving on your content, you must ensure that your content complies with our Program policies. Some types of dynamic content are high risk (particularly user-generated content like forums). In these cases where we suspect risk, we may restrict ad serving until we are sure that it does not violate our policies. These restrictions are not considered policy violations unless Google determines the content in question does in fact violate policies, and if that is the case, Google will issue a separate policy notification.
If you know your content to be non-policy violating, you can vouch for your content by letting us know it is safe through requesting a review. However, please note that if we receive multiple requests for review that turn out to be actually policy violating, we may limit your ability to vouch for future cases of suspected risky content through review. For more information on requesting a review, see: Ad Manager, AdMob, AdSense.