I have been listening to audio books on various ipods for several years. These are in the mp3 format, not AAC. I have always used the 'Remember Playback Position' option in Itunes, and this has always worked. On the iPhone however, this works only about half the time. After listening to the audio book for awhile, then switching and playing another song, then returning to the audio book, it will sometimes start from the beginning. This also happens occasionally when I sync the iphone with my mac, or charge it fully. Anyone else experiencing this very frustrating issue?