Detection of black mark isn't correct on iMZ320

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I'm using since two years now Zebra printer type imz320 and I have a problem with it. I received my new labels with black marks, between each black mark there is 24cm of height. I setup the printer as "black mark" and sent the ~jc end ~jg commands to calibrate it. Problem is that when I print (always the same image) the label sometimes stops 3 or 4 mm before the black mark so I can't cut the label because there is inside this black mark a "pre-cut", so I have to pull manually the label to see this pre-cut, but after that when I print a second image, the printer is printing the first label and then is feeding a second label...

For information I'm using labels with black mark as well but the length between each black mark is about 17cm and it's working perfectly.

Problem is located at this media sensor I guess which is stopping the label 3mm approx before the cutter.printer issue.JPG

I updated the firmware to the last version of 15-10-2018.

Many thanks for your help!

Enclosed are some pictures.