title: MySQL 5.6 replications stop without any error
body: <p>I've noticed that my MySQL replications don't update data in the slave server.</p>
  
  <p><code>SHOW SLAVE STATUS</code> shows no lag behind the master and no errors. However, the slave has outdated data (older than 30 minutes; the slave and the master is in the same network). </p>
  
  <p>If I do <code>STOP SLAVE</code> and <code>START SLAVE</code> and check the slave status I see that the slave is behind the master for around 1720 seconds. However, If I check slave status again (after less than 3 seconds) I see that the slave is no more behind the master (0 seconds). </p>
  
  <p>Also, after I restart the slave replication thread (<code>STOP SLAVE</code> and <code>START SLAVE</code>), the slave gets all the new data from the master. </p>
  
  <p>How could I troubleshoot this?</p>