I get the same thing on a P7000. At a workshop I held in Stockholm in DTP before Christmas it turned out like this in various pictures of my students. Tried with different resolution and switched to 3 gray colors with DTP. My picture picture turned out fine but not any others. At the same time, there are good images without streaks in Mirage and Epson's driver, but only in QTR. Updated to last QTR.
I consulted a printer consultant and wondered if a print head broke? What he told me that the printer has three printhead resolutions and chooses one to print with. Tried with different resolution on image and print but QTR may not always choose the highest resolution? Anyone who knows?
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Unfortunately, I don't have any good pictures now of the bad ones, but they are similar to yours, both in high and low days but more visible in smooth surfaces of course. Sending with a picture that works but not so much smooth surfaces...
