We have confirmed with rackspace the cloudflare incident appears to be the root cause of the intermitant outage and is affecting cloudflare customers. It's now also listed on rackspace's status page as well:
We have identified that there is a route leak with cloudflare which maybe causing the issues with any clients hosting dns with cloudflare. See more info on their status: https://www.cloudflarestatus.com/
We are still investigating.
Posted Oct 05, 2015 - 15:59 UTC
Hi - we are currently investigating intermittent connectivity issues reported on some client websites.