Canon S6300 Colours are incorrect.

Print quality used to be great, however, since printing a large amount of photos things have gone wrong. On a large block of red, orange began to appear gradually in lines. Looked kinda cool, but not what I wanted, or what was on the monitor. Since then I've been getting vibrant greens of various shades, with the same image, and frequently the top of the image is of a darker, dirtier tone.