I had the same thoughts about my audio port crapping out on me. I bought an fm transmitter/ charger dock for my car so I can stream music over the web to my car stereo when i drive. however the music player stops randomly. this seems to be an issue for a number of people after looking through the webs about it.
not trying to hijack the thread (but i am) is this similar to what you experince? i dont think it is becuase my music -pauses-, it does not continue to play through the regular speaker.
It seems according to a few posts ive read, that a change in the data connection is what causes the music to stop. going from 4g -> 3g or what have you. and since i only have this issue when im trying to listen in the car, riding down the road, i can see a correlation. and its not just when playing streamed media, it will pause when playing stored files from the memory card too.
fyi - AOIP -6/30 i think it is.