CloudFlare, a popular DNS provider used by customers as well as WP Engine have reported DNS issues in multiple locations, you can find more information here https://www.cloudflarestatus.com/ Your site may be impacted by this issue as well as your staging sites or any sitename.wpengine.com url’s. We recommend following their status page for further information as this is outside of WP Engine control.
We will update this page once the issue has been resolved according to CloudFlare.
UPDATE: [4:28 PM CDT] CloudFlare is no longer experiencing issues. We have received notification that the issues that impacted their Chicago, Dallas, and London datacenters have been resolved.