why my wordpress site always timed out everyday

Question

At first, I built a wordpress site on EC2 and after few days , website always shows timed out message.
And then I move to Lightsail and it still shows same wrong msg, even I reset website but still not working.
But I can login ssh and sftp but SQL site can't connect.
My domain name is using route53 and I set a aws alarm, here is alarm msg shows:
Alarm Details:
- Name:                       awsroute53-25103daa-41c8-4e4f-a07e-86f23770222f-Low-HealthCheckStatus
- Description:               
- State Change:               OK -> ALARM
- Reason for State Change:    Threshold Crossed: 1 datapoint [0.0 (10/02/22 07:27:00)] was less than the threshold (1.0).
- Timestamp:                  Thursday 10 February, 2022 07:28:37 UTC
- AWS Account:                xxxxxxxx0044
- Alarm Arn:                  arn:aws:cloudwatch:us-east-1:401785220044:alarm:example-com-awsroute53-25103daa-41c8-4e4f-a07e-86f23770222f-Low-HealthCheckStatus

How should I test connecting problem? Or where can find the solution?

Answer

Check Burst capacity and CPU utilization of your Lightsail instance. Maybe you are ran out of burst capacity.

why my wordpress site always timed out everyday

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