Why did the bands of my anomaly detector in CloudWatch change suddenly?

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I created an anomaly detection band on my Amazon CloudWatch metric, but the band changed significantly. I want to know why my anomaly band changed.

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When you turn on anomaly detection for a metric, CloudWatch applies statistical and machine learning algorithms.

After you create a model, CloudWatch anomaly detection continuously evaluates the model and makes adjustments for accuracy. When another anomaly detection model performs better than the current model, CloudWatch anomaly detection switches to the new model and the anomaly detection bands change.