When printing a few dozen copies of the same sheet, the printed colours changed. The first several sheets were ok but the next ones have distorted colors. From now on, everything is printed incorrectly. In the attachment, on the left an example of a correct printout, on the right a wrong printout (darker), slightly different colors, you can see it on the background of a brown stamp.
Please give me a hint as to what may be the cause of the color distortion.
when ever you trying to achieve color consistency you have to go with color calibriation and for color accurcy you have to go with color profiling
So as Gabiene said try to run the color calibriation and make sure that you select the same color correction which you used to print with.