I exchanged #7 at Best Buy, and I opened the new device (#8) there in front of them. This one had large blue and pink discolorations, which one employee saw bright as day, but another couldn't see anything wrong. I want ahead and returned this one.
One defective device is understandable, two is bad luck, but eight in a row is telling me all are going to have some issue. I await Kindle #9 from Amazon Monday.