Solve : laptop sound?

1.	Solve : laptop sound?
Answer» When I PLAY a song on youtube or itunes, the sound suddenly turns off after 10-30 seconds. When I turn the volume up or down, the sound is working again. Does anyone know how I can permanently turn on the sound?Does this phenomenon occur on both speakers and headset? What is the make/model of the computer and the OPERATING system? Is this SOMETHING RECENT or has it always been like this? truenorth

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