Patch 5.4.7hotfix3 is the unofficial name for patch build 18019 that went live on March 12, 2014, slightly under two weeks after the initial Patch 5.4.7hotfix2 build 17956 that was released on February 27, 2014. The reasons for this hotfix build are not specifically known, but there could be an official blog upcoming detailing some related hotfixes.