I've had my MS for over 6 months now. When listening to MP3s from USB the whole time I have had the vehicle it would play music all night long when parked at my house but not at work. I've been told it is a bug related to scheduled charging. This is particularly annoying when listening to audio books. I was hopeful it would be fixed in 7.0 but the problem persisted. Now in 7.1 it still happens sometimes, but more often than not the vehicle will just lose the audio source completely, whether it was MP3s or FM radio. You get back in your car and nothing is selected. I had this happen to me this morning after parking for only 20min. Every vehicle I have ever owned has had no problem maintaining a selected audio source. Even better, as far as I can remember, all of my vehicles would save state when switching between audio sources. So for example when listening to a CD or MP3s if you switch to FM and then back to the original source it resumes where you left off. I had been working around this by texting myself the track and time I was on when I parked at home overnight so I could manually resume my audio book when I got back in the next day. But now it is so unpredictable I've given up listening to audio books until this problem is solved. It just seems crazy to me that the car can do so much but not this. In fact even more annoying is when I'm backing out of my garage in the morning I have to close the back-up camera and interrupt the auto-HomeLink (I think?) in order to select an audio source to listen to. I pretty much love everything about my MS except for this ongoing annoying problem.