Amazon EC2 instance - issuing "top" command just goes blank on the ssh terminal

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http://serverfault.com – I have created an Amazon EC2 micro instance, running Amazon AMI. I logged into the server using ssh client. Once it logs in successfully, if I issue the "top" command, the top output never shows up and the command never returns. It constantly waits. I have to kill the ssh session and re-login. Of course none of the other things like java, tomcat etc., are working. I rebooted the server, same problem persists. I finally changed the instance to "small" instance, even there I am facing the same problem. During some times of the day, it seems to work fine without the above problems. Anybody has (HowTos)