How does your nozzle check look? How does it look when you do a printed color purge in black and then do a nozzle check? I had a situation where my ink, which HP called settled ink It been sitting stagnant for sometime, and the ink settled in the bottom, then thicker ink worked its way to the print head. But on the other hand, it would have nothing to do with that if your ink isn’t dry, that will have all to do with the lamps shutters. I wonder if it’s sticking to begin with, and then loosens up after a few passes