Radeon HD6950 Audio Issues

This is an audio problem, but since it has to do with the video card's built in audio I have posted it in this section. Basically when I'm using the computer, the audio is (at first) perfectly fine, but after a while, it's randomly disabled and I can't get it to work again unless I restart the computer. The Motherboard's audio is disabled, so there shouldn't be a conflict there. Any ideas as to what could be causing this? Specs are in my sig.

Have you locked your PCI-E bus speed? I've heard of rare occasions where the HDMI will bug out with overclocked cards and generally this is the cause.

How do you have your speakers connected to your PC? How many monitors are you using?

I have a stock HD5450 and since downloading CCC 11.8 I have also got this issue with my HTPC using the HDMI output for audio. It will say no recognised speakers plugged in after sitting idle for a while. I have downgraded to 11.7 to see if that fixes it, so I would try the same on your pc.