Laptop (lenovo G460) going into automatic mute

I use a lenovo G460 laptop with windows 7 64-bit. for the past few days or so i've been noticing that the laptop would mute itself especially when im watching a movie or using some media player. I would get a windows sound after a while, now after this sound a few minutes later it would mute itself. Then i have to use the mute/unmute option in the keypad to get back the volume. what could be causing this trouble??? any help??
Solved!
Go to Solution.

ship your laptop back to lenovo. mute/unmute problem was a "launch board" failure.
http://forum.lenovo.com/t5/IdeaPad-Y-U-B-V-and-Z-series/U330-Mute-Unmute-continuous-loop/m-p/56164

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