Answered a similar problem here.https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/Pimxa-iP8750-printing-banding-lines-on-print/m-p/494290/highlight/true#M73183
I was seeing similar a problem.I spent 4 hours debugging the problem, including cleaning, calibrating, and manually calibrating the heads, updating drivers, and experimenting with color profiles between software, plus paper types.- The auto-calibrati...