From The Guardian, October 20:
Progress! Amazon Web Services say they may have found the cause of the problem.
In an operational update, AWS say:
We have identified a potential root cause for error rates for the DynamoDB APIs in the US-EAST-1 Region.
Based on our investigation, the issue appears to be related to DNS resolution of the DynamoDB API endpoint in US-EAST-1. We are working on multiple parallel paths to accelerate recovery. This issue also affects other AWS Services in the US-EAST-1 Region. Global services or features that rely on US-EAST-1 endpoints such as IAM updates and DynamoDB Global tables may also be experiencing issues....
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