Now it gets weirder, we discovered that if we print some 10 sheets of each of CMYK solids then the lines disappear for some time.
We first noticed when we were printing several thousand A5s with very little toner coverage that after a while the prints started getting mottled, so we did the solid CMYK thing to try to force some toner through, the mottling disappeared as well as the lines.
There obviously still is a problem even if we've found a workaround, could it be tired developer material?
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