title: Wordpress Error 500 (Internal Server Error)
body: <p>Last week, I moved the wordpress instance to new server. After that I frequently get 500 Internal Server Error. This error comes all of the sudden. The apache error log does not contain any fatal error messages but it contains PHP warning messages. </p>
  
  <p>Whenever this error occurs, I restart the apache and the site is back to normal state. What may be the reason for this 500 Internal Server Error?</p>
  
  <p>How does restarting apache solves this error? Only this site gets this error, other sites deployed to this server are working fine.</p>