Well, my reader just did it again today. I swiped to turn the page on what I was reading and it went blank and then started rebooting. It came back up to the Home screen, and the thing that I noticed was that some, but not all, bookmarked pages under "Notes" went back to an earlier date. I have several daily devotionals I read and the bookmarks came back dated July 19th. And one of those books was not listed at all under Notes. Though the book was still in my list of books. I just had to go back to the last date I read from it and rebookmark it again. Funny thing is that I now remember that this is the same thing it did the last time and the very same book was missing from Notes. The "Continue Reading" square showed a book that I hadn't been reading when this happened with a July date, though I know I have read it more recently than that. I didn't try taking out and reinserting my SD card, as I was just trying to pay closer attention to what had taken place. If it happens again I will certainly try that. Very strange...