chrisje, here is the answer i got:
The devices take time to learn who should go to what location. As new DNS servers make requests they are send to either our primary location (PHX) or secondary location (Ashburn) for the first request. The device then learns which node will perform best for the requester (this is based on latency, load on the servers in the cluster, number of hops, etc) and will send subsequent requests to that location. So this might of been the device learning where he should go (because this was the first request) or Ashburn may be a better connection for him. I am going to guess that it was a learning cycle for the device based on the traceroute but that is an educated guess at best.
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