title: AWS:ELB health is failing or not available for all instances
body: <p>Our ELB is intermittently failing health checks on instances and throws errors "Environment health has transitioned from Ok to Warning. 2 out of 2 instances are impacted. See instance health for details" and after a minute it throws "Environment health has transitioned from Warning to Severe. ELB health is failing or not available for all instances"</p>
  
  <p>It happens everyday on same time. Also I suspect that it happens whenever our CRON runs but I am not sure as it doesn't happens on other ELB instances.</p>
  
  <p>I would like to know the root cause of this kind of problem as I searched through the forum and everyone had some different situations and cannot figure out what problem it would be for us.</p>
  
  <p>This is our Production instance.</p>