xerox d125 vertical white getting after 10-15 print

[Omkarmore]

hey i have xerox d125 and i am facing problem of vertical white line randomly after 10-15 prints.
i changed drum .
devloper is ok.
try all paper size a4, letter, a3 but problem not solved.
genuine toner is used.

some photos of print
WhatsApp Image 2022-08-17 at 11.10.42 AM.jpgWhatsApp Image 2022-08-20 at 4.02.50 PM.jpgWhatsApp Image 2022-08-20 at 4.02.26 PM.jpg