content: I have two kindles. One is a Kindle 2. I've never had screen issues with it. The other is the Kindle Keyboard and I haven't had issues with that one either. My dad has been using his Kindle keyboard for a long time with no problem either. However, my mother has gone through several starting with the Kindle touch and moving on to three different Paperwhites. They have all had the screen striping that you mention.  I've always thought that it's something to do with the touch screen.