title: pysftp SFTP file transfert is being suspended after 30MB
body: <p>I'am trying to transfer files from SFTP to Local and for some reasons, the transfer of files with more then 30MB is suspended automatically when acheiving the 27-28 MB without getting any error message.</p>
  
  <p>This is my code :</p>
  
  <pre><code>    for entry in sftp.listdir_attr(remoteFilePath):
          filepath = remoteFilePath + '/' + entry.filename
          sftp.get(filepath, os.path.join(localFilePath, entry.filename))
          sftp.remove(filepath)
  </code></pre>