Hello,
With our advertising programs we strive to create an online ecosystem that benefits publishers, advertisers, and users. For this reason we sometimes have to take action against accounts that show behavior towards users or advertisers that may negatively impact how the ecosystem is perceived. In your case, we have detected invalid traffic or activity on your account (Publisher Code: pub-40057572374) and as a result it has been disabled. Because of this, the ability to serve and monetize through all products which depend on AdSense will also be disabled (for example, AdMob and YouTube).
We understand that you may want to know more about the issues we’ve detected. Because this information could be used to circumvent our proprietary detection system, we’re unable to provide our publishers with information about specific account activity.
For Ad Exchange Publishers:

• Ad Exchange account disabled for invalid traffic

Once you’ve made changes to your site(s), app(s), channel(s) to comply with our program policies and terms of service, you can reach out to us using our appeal process. Please be sure to provide a complete analysis of your traffic or other reasons that may have led to invalid activity in your appeal. pub-4005757237431 is your publisher code, which you can enter into the appeals form to identify your account. Before submission, please review the list of the top reasons for account closure.
Thanks for your understanding.
Sincerely,
The Google Ad Traffic Quality Team