Sept 29 2014
Uploading YouTube Video: https://www.youtube.com/watch?v=UdJ2UnMJgMA&list=UU04BB_aoFsvFSp-nQ-_uf7A
1) from beginning to ~0:17:00, I have no sound, but it was from being in a quad-bike then the truck at the beginning of video, @17:15 I decide to play with my audio setting and all came back online.
2) A drive @ 0:33:00-0:35:00 works fine.
3) Driving Quad-Bike @ 55:30 immediately kills sound, and I fix @ 59:10
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September 30 2014
The problem did not show up again. I drove a lot too.