Reset and configure again qln420 Zebra Printer

Hi all see this video:

 

With a Java Servlet.

https://drive.google.com/open?id=0B0r6bXZX5Q7CY2NyclloMlpZeUU

if you see the impresion is done, but eject 4 labels, not know why.

 

this is other video now form C# .net same problem.

https://drive.google.com/open?id=0B0r6bXZX5Q7CcG53Z1JrUmM0V0U

 

in this other video, when i close the case, advance/eject 4 labels and not posicionate at the first of the label.

https://drive.google.com/open?id=0B0r6bXZX5Q7CWjRobHQtbFlMLVk

 

how to fix these problems?

 

and how to disable the printer sleep?

 

Much thanks.