I'm hoping someone can help me! I just received my 6d mark ii for Christmas in 2019. I went out for a shoot last week and noticed these dark black vertical lines in all my images. I changed memory cards thinking it was a bad card, but it kept happening! I turned the camera off and on, took out the battery, everything! Finally I changed it to video then back to camera and the lines were gone. Until I went to use it again a few days ago and the lines are on all my images again. HELP! I've attached a close up of one of the images where you can see all the lines