Dear Sirs or Madams,
please inform me about your Operating System, Service Pack Version, Version of your printer driver.
You can try to change the usb hardware port......in some cases a change helps, because all printer drivers will be installed again.
Maybe the reason causes this problem seems to be of a different nature!
Check the length of your usb cable. The maximum length-standard is approx. 3-5 Meters. USB-Cables longer than 3-5 Meters are very defective - there are many signal losts, voltage variabilitys and morge....