Amazon has pulled down books that contain author names and book titles in their description and keywords. Most of this keyword use has occurred in the Kindle Direct Publishing (KDP) program; some authors were warned to change their keywords, while others found their books were simply pulled off the site. Check your book description and keywords and pull any reference to other authors and books - before Amazon does it for you. To learn more: http://www.amarketingexpert.com/amazon-making-big-changes-authors-beware/