I've had mine nearly as long as you have and have had almost no problem with it, but early this week, when reading a book nearly as long as yours, suddenly the page turn wouldn't work. I could go to the menu option, but returning to the book did not reactivate the page turn. I had to get out of that book, open another, turn some pages and then go back to the book I was reading in order to be able to read again.
However, I then noticed that the battery was draining rapidly. It went from full, through all the stages to low battery in a couple of hours. I charged it overnight and then began reading the next day and the battery drain continued. I reset the Reader and deleted the book and then reinstalled it and the pages turned faster than I can remember them ever turning. The battery drain has stopped.
No idea what that was all about. The book, by the way, is on a memory card, which is where most of my books are anyway. And maybe the page turn speed is where it is supposed to be and I'd just gotten used to them turning slower?
I've got a Kindle on order and if you wanted to be paranoid, you could say the Reader is in a snit about that.
Jim