HP 2800 - usb timeout and wrong colors

Hi,
since we updated our macs from 10.2.7 to 10.3.9 and a mini with 10.4.7 our hp 2800 ink printer is not working properly anymore. I have asked hp and all these problems are known, but in summary they do not help us:
1. Print jobs are just stopped or simply disappear after 2 minutes. hp says, this is because of a "usb timeout under 10.3 and 10.4". We should buy a network interface for the printer instead of using usb (sic!!).
Is this timeout usb problem known? How can we fix that?
2. The colors are dull and strange now. Under 10.2.7 they have been just perfect. hp says, this could happen, when the driver has been installed doubled. but this is not the case with our macs. Callibrating doesn't help, because the colors are too odd.
Both problems appear with a G5 with 10.3.9 and with intel macs under 10.4.7, no matter if direct usb or shared. Replacing the driver with a new one did not help.
Me and my colleages are pretty frustrated, has anyone a good idea?
Thanks,
Markus

The document here may help resolve issues with your Photosmart 6520 printing incorrect colors. Be sure to check the vents are cleared.
Bob Headrick, HP Expert
I am not an employee of HP, I am a volunteer posting here on my own time.
If your problem is solved please click the "Accept as Solution" button ------------V
If my answer was helpful please click the "Thumbs Up" to say "Thank You"--V

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