Update Upstream has installed a workaround and is looking to drop cogent in the near future. We have been able to restore routes to Dallas PoP. If you encounter any Dallas issues please let us know.
Update We still await upstream fix
Investigating - We are investigating a potential issue that might affect the uptime of one our of services. We are sorry for any inconvenience this may cause you. This incident post will be updated once we have more information. We have removed Dallas from Anycast mixes while we await upstream feedback.