Between 8:56 AM and 12:15 PM PST, some customers experienced increased error rates and latencies for actions on the AWS Lambda Management Console in the US-EAST-1 Region. AWS Lambda API calls via the SDK and CLI were unaffected. Between 11:22 AM and 12:40 PM PST, some invocations of scheduled Lambda functions also experienced elevated error rates in the US-EAST-1 Region. Any unprocessed invocations for affected functions have been reprocessed based on the retry policy on the function. The issue has been resolved and the service is operating normally.

from Amazon Web Services Service Status