We are witnessing an increasing amount of API-related errors on AWS's us-east-1 region, specifically "Runinstances". Users might face errors as part of various instances' provisioning as well as processes-related instances replacements and scaling operations.
We're currently looking into it alongside AWS in order to resolve it as soon as possible. For continuous updates, please refer to AWS status page: https://status.aws.amazon.com/
We're truly sorry for the inconvenience and we'll be sure to update once this issue is resolved.