My PC Sound

My PC stops producing sound after 15 minutes or so when I turn it on I tried refreshing it but still no good.It is a sony Vaio windous 8
 
It may be an issue with either the hardware or the drivers. Let's try updating the driver first. Can you take a screenshot of what is under the "Sound, video, and game controller" section in the device manager? You can access the device manager by going to the start menu and searching for "Device Manager".
 
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