I had a weird problem ast night. I couldn't wake up my K1, but did notice the the silver thingy was moving around as if Amazon might be upgrading my K1. Today. I still coudn't wake it up. I shut off my Kindle. Nothing. Then I took out my SD card, which had nothing on it. Put the Kindle back on.Then, I reset. It worked. Then, I noticed that 2 of my Outlander series books were gone, but 1 Outlander series book that I had finished reading was there. I looked in my contents page. Nothing. Wasn't there. So tonight, I re-downloaded the 2 books again from my computer. Does anyone know what could have happened? I know that I had not deleted them.