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Hello.
Looking at the document below, the baseline for t3.small is a low number.
Therefore, I suspect that t3.small will no longer be able to handle EC2 hosting four WordPress sites at the same time.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/burstable-credits-baseline-concepts.html#burstable-performance-instances-credit-table
There may be other causes, so I think it would be a good idea to check the EC2 system logs.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/troubleshoot-unreachable-instance.html#instance-console-console-output
Why not try using a general-purpose instance type that does not burst, such as m7i instead of t3?
https://aws.amazon.com/ec2/instance-types/?nc1=h_ls