Hi jarome,
Your issue is not a known issue as I stated above. What has been provided is a potential solution with the system as it is now. I am sorry that you did not find the manuals helpful. I do not know if or when there will be an upgrade to the firmware for the WorkCentre 6015. The machine is covered by the Total Satisfaction Guarantee if you would like to explore that option please contact your sales representative or Xerox directly at 1-877-362-6567.