An official BIOS or driver provided through Gigabyte would be great. Until a surefire fix is available, here's my experience with this.
I believe I am having the same issue. After going through a mess of switching between the onboard sound as well as discrete sound cards and USB sound and with different drivers, I wasn't able to pin the problem down.
In the end, DPC latency seemed to be the culprit (thanks for the link to the tool!).
Disabling various devices in Device Manager was not helping me. After running with NICs, USB, and sound controllers disabled, the DPC latency would go down but eventually spike back up and stay in the red.
On a whim I completely disabled the USB 3.0 controller in the BIOS. Running for a couple hours so far, the problem hasn't resurfaced (through perhaps some fluke of my computer usage, it has always been present). I am running of the onboard Realtek sound and nothing is disabled in Device Manager (the USB 3.0-related entries are obviously no longer there).
I'm hoping this fixes it in the interim so I don't have to lose more time trying pulling my hair out from audio-frustration until an official fix is out.
P.S., I'm willing to try beta BIOS revisions, but the Gigabyte webpage for the Rev 2.0 motherboard shows FB5 as the latest beta. I'm a little wary of flashing my BIOS with files not directly linked to by the manufacturer. I'm guessing this is "closer" to the in-house builds and was obtained directly from communication with Gigabyte employees?