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An e-commerce business has recently moved to AWS serverless infrastructure with the help of Amazon API Gateway, AWS Lambda, and Amazon DynamoDB. The application performs as expected on a normal day. But, during peak periods, when thousands of concurrent requests are submitted, the user requests are initially failing before finally succeeding. The development team examined the logs for each component with a special focus on the Amazon CloudWatch Logs for Lambda. None of the components, services, or applications have logged any errors. What could be the most probable reason for this failure?