I primarily purchased the Sansa Express to download books from our local library via Overdrive.com. Just until recently I have been able to turn the player “OFF”—right in the middle of chapter whatever, (chapter 5 for instance)—and then turn it back on, and have it pick up right where I left off listening to the book…but, yesterday, and today it just won’t do that. I have to write down what chapter I was on. Then scroll and hold the advance minute button to hopefully find where I was last listening. Does anyone know whats causing this to happen, and how can I correct it back to the way it was? Thank you.