I upgraded my iPhone 3GS to iOS 6 from iOS 5 last week.
Since then the phone doesn't remember its position in audiobooks any more and most often (sometimes it remembers the position) starts at the beginning of a chapter near my last position. This happens whether or not the phone was turned off between plays.
Also, the phone forgot its ringtone and when I configured it to use my ringtone again, it suddenly started playing it very loudly despite the fact that it was set to mute. It also wouldn't stop playing it for several seconds even though I returned to the home screen and pressed the on/off button a few times.
Are these issues with iOS 6, new "features" or problems with my old phone?