Randomly losing sound in "World of Warcraft"

Hi!
I would like to point on my problem that i got recently - everytime when i open WoW, and play for about 1 - 5 minutes, i am losing my sound in WoW and in Windows too. I already tried to install 100 different drivers for my sound card (Conexant SmartAudio HD) on my laptop (MEDION AKOYA E6221 (MD 97753)), and i reinstalled Windows too - nothing helps...
I had NEVER before problem like this. Honestly, i never have problems with my computer because i am System Administrator myself and i am familiar with them very good, but this problem is out of my reach because i can't figure out what is causing this problem. I doubt that there is some problem with chip itself, because everything is working just fine until i open WoW...
If someone had this problem, or similar one before, and is willing to help, PLEASE help me because i am helpless...
Thanks in advance!
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Sorry if i trouble, but still there is no solution to my problem that i have...
I tried some of the things like:

Disabling my addons (deleted them all),
Removed CONFIG.WTF and reopened the game with a fresh, untouched settings (everything on default),
Changing my sound settings in Windows (tried all the settings from 16 bit, 44100 Hz (CD Quality) - 24 bit, 192000 Hz (Studio Quality)),
Selecting/Deselecting "Allow applications to take exclusive control of this device", and "Give exclusive mode applications priority",
Disabling Microphone, HDMI, and Stereo Mix devices,
Overheating of the CPU or the mainboard is not possible, because my laptop is in a mint condition 24/7.

N O T H I N G works...

I already mentioned that i have reinstalled my Windows and downloaded all the drivers from the official, manufacturer page (which i used before) - No solution...
Very important thing that pushed me to open a topic here is that my sound work perfectly until i open WoW, and i have a sound through headphones jack. When this "disappearing" occur, i just need to plug-in my headphones or my mic and a sound just pop-up like it have never been lost, and after 1 minute i am losing it again.
And losing sound is very randomly - It can take up to 2 hours, 'till 1 minute to disappear...
I am more than desperate to find a solution to this VERY annoying problem, because playing with headphones on my head is just not an option for me.
Anyway, one more thing - If i open WoW, and just minimize it down to taskbar (and my option in "SOUND/SOUND IN BACKGROUND" is selected), i am not losing the sound, but almost same moment when i maximize the game, 1 - 5 minutes and sound is off again... Really weird things...
Thanks for Your answer, and looking into my topic!