edge-router goes dead every minute and starts back after sometime

router service is going dead every minute and it comes back automatically , we can see the error logs in system.log with exit code 3 :
2021-06-11 11:53:42,081 main INFO NGIX-ADAPTOR - Nginx.isRunningAlready() : exit code of the command 3

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Every 2.0s: apigee-service edge-router status Fri Jun 11 12:04:59 2021 apigee-service: edge-router: Not running (DEAD)