title: Elastic Beanstalk instance frequently being replaced by a new one
body: <p>I am testing Elastic Beanstalk for a few days and have noticed that the instance(Windows) is frequently being replaced by a new one.
  I have only one idle EC2 instance, that doesn't do any work and returns 200 OK on the http 80.
  At least once daily, a second instance is started and the current one is terminated. After the process ends, I am still left with one instance as before, but it is a new instance and the old one is gone. This happens at the same time every day, as if it was scheduled.
  I have checked the logs and there are no indication that there was any technical issue or other alerts.
  For me this is a big issue because I expect the instance to get replaced or recycled only on demand, or in case of an technical issue.</p>
  <p>What is causing this issue, or is this a normal behavior?</p>