Our 3rd party CDN provider has informed us about maintenance that has started with their service. This is similar to the patching and restarting that we recently did on our systems to address the GHOST vulnerability, http://wpengine.com/2015/01/27/addressing-ghost-vulnerability/.
We will continue to monitor this throughout the day and update this post once we have received confirmation that this maintenance has been completed. Thank you for your patience in this matter.
Update 11:30 PM: This maintenance is still in progress. There has been minimal reports of CDN downtime due to this. We will update you once we receive the all clear from our 3rd party CDN provider.
Update Jan 30, 6:30 AM: [Resolved] CDN maintenance is completed at this time.