I'm on my second Kindle. The first one had a white line going down the screen. The second one doesn't seem as fast to refresh, but that's not the weird thing. Every few page turns it doesn't flash black like it is supposed to; instead, the letters seems to disintegrate and are replaced with the new ones. I have a short video of it here:
http://www.youtube.com/watch?v=Q2eJyZbJxP8
Anyone else experience this? Would you call this abnormal?