I read every night before I go to sleep and every nite when I turn my nook on it's iffy if the book I'm currently reading will actually open so I can read it! Very frustrating.... I click on the little book at bottom of page or I click on the cover of the book ... sometimes it works,, but more times than none it won't open. I shut the nook down completely and re-boot which takes forever... and have to hope for the best.... Is there an upgrade or something to fix this??