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Hi, thank you for your question. In most cases, starting and stopping your instance will migrate the instance to another physical host computer [1]. If you have stopped/started the instance multiple times and the I/O errors persist, it is likely that the problem lies within the instance itself, rather than the underlying host/hardware. Please refer to this guide for help troubleshooting common I/O errors within your EC2 instance [2].
Additionally, please ensure that your read/write IOPS are not exceeding the capacity of your EBS volumes. You can view your read/write IOPS by monitoring the VolumeReadOps and VolumeWriteOps volume metrics in CloudWatch [3].
[1] https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Stop_Start.html
[2] https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/TroubleshootingInstances.html
[3] https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-io-characteristics.html
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