I was hoping it could just be a line sensor or something causing the rollers to overcompensate. Was just about to go in and clean her up but it might be all for not if that's the case. 
How likely are you to recommend HP Large Format Knowledge Center to a colleague?
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Not at all likely
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Hey there,
I've got a toughy, who loves a good challenge?? Below are attached a few examples of my current issue. We've never had this issue before to my knowledge, and it's progressively worsening. However, it's come in stages (as you'll see in the examples provided). We aren't experiencing so much as banding, but more so an overlap of imagery, as if the substrate is inconsistently feeding. It seems like the speed is fluctuating randomly as to affect the vertical disposition of the image, so each pass could be positively or negatively overlaying.
We noticed it once while printing a series of circular designs. There were 9 circles placed horizontally on the sheet, evenly spaced in rows of 10. The first couple were good, then one row would be blurry and vertically offset. Then the next 3-5 rows would be good, followed by a very blurry one, as if the paper slipped further forward than anticipated mid-print.
If you have any insight, I'm pulling my hair out over here! Thank you much!!