Hi jjjeroenski,
Thank you for using the Xerox forum.
I would suggest that you review these issues with the local service team manager.
You seem frustrated and the manager wants to help you get good performance on your machine.
This helps his serviceman spend less time, and makes Xerox revenue from a performing machine.
If you are outside the USA you should contact the local support center in your area which you can find here:
http://www.xerox.com/about-xerox/contact-us/enus.html