I keep running into this issue where I have my headphones plugged in, animate for some time and then if I unplug my headphones (or my laptop goes to sleep) the audio stops working. The opposite is true as well, if I am unplugged the audio works but then I plug in and it no longer works.
Some times playback no longer works either (clicking the play button or with the hotkey D).
Editor information
4.1.12 (I can't move onto 4.2 at the moment)
No error messages.