After playing for a bit on my world, I often leave the client open for when I want to hop back on. If I am lucky, I can get back on without problems, but often, depending on how long I've been idling, the client loses all audio.

Losing all audio includes the buttons to go into single player and multiplayer (I use those to test if it still has audio or if I have to restart my client) and as well as every in-game sound.

Steps to Reproduce:
1. Play a world for a bit.
2. Idle overnight or for a day (I haven't pinpointed the time required).
3. All audio is gone.