An update was released to a canary deployment to initially us-east-1 region, then ap-southeast-2 and eu-west-1, this caused errors to occur occasionally for GET requests for all services except for S3.
This deployment was later rolled out wider within all regions, as the deployment rolled out more errors were found with GET requests. This release has now been rolled back and has since been resolved.
The root cause of the issue in the deployment has since been found.
This incident has been resolved.