I have the same vertical lines issue. The way I found is this: make sure brightness is not low (let's say around 75% of the maximum). When stripes appear keep using or keep active your iPad screen for at least 5 minutes. Not less! Then turn off and on the iPad once quite quickly. Lines will disappear and will stay away until your iPad is on. If they are back again that means or your brightness is too low or you didn’t wait 5 minutes. I don’t know why it happens but it sounds like a kind of “screen warm up”. Remember that everytime you switch off the screen then stripes will show up again And you have to repeat steps above