How to fix Strange line in the middle of the print

a fine line of any color will show up randomly during a print

For the lines I noticed they show up in the rip occasionally. Don't know why they just appear at a certain size and placement. If she resized just a small amount the line should go away. It only happens in certain cases the size is not the determining factor as it changes per image.

if it doesnt solve, then re-install the software