Our service provider experienced a network congestion issue:
[12:14 PM PST] Between 7:14 AM PST and 7:59 AM PST, customers experienced elevated network packet loss that impacted connectivity to a subset of Internet destinations. Traffic within AWS Regions, between AWS Regions, and to other destinations on the Internet was not impacted. The issue was caused by network congestion between parts of the AWS Backbone and a subset of Internet Service Providers, which was triggered by AWS traffic engineering, executed in response to congestion outside of our network. This traffic engineering incorrectly moved more traffic than expected to parts of the AWS Backbone that affected connectivity to a subset of Internet destinations. The issue has been resolved, and we do not expect a recurrence.