This buzzing sound doesn't mean it's related to the soundcard/sounddriver, can be actually anything, some other bugged or interfering software, videocard overheating, hardware faults... had that problem too a few times but for me it was mostly caused by overclocking and temperatures. Just google for 'freeze with sound loop' or similar you will find hundreds of threads with hundrets of solutions, or no solutions
Did you also monitor your videocard temps too? Use GPU-Z or MSI Afterburner and check the highest readings after gaming a few minutes.
If such error starts to happen out of nowhere first thing is to revert any changes you may have made, any setting in bios, video drivers, driver updates, automatic windows updates and so on. Check temperatures of every high temp component, CPU, Videocard, Mainboard Chipset. Even if all fans are running, over time the coolers tend to get jammed with dust between the cooling fins which isn't always visible at a first look. Take out your videocard and check that and try to get at least a good look between the cooling fins of the cpu cooler (but cpu temps look fine).
If you update drivers for mainboard (which is at least worth a try) always load them from the hardware manufacturers homepage e.g. for your soundchip it's Realtek, for your mb chipset it's Intel. They are usually more up to date than from mainboard manufacturer's site.
At Gigabyte's website driver for your soundchip is v2.70 (2012/10/04)
At Realtek's website is v2.71 (2013/04/08) http://www.realtek.c...3&GetDown=false
Edited by S3ti, 12 June 2013 - 01:34 PM.