Problem with sound because of hardware?

I own a Acer aspire 6930g which I have bought recently.

However, after around 20 days of use, the touch sensitive sound controller seems to be keep thinking that I am turning the sound down, even when I am not touching it. How can I fix this.

Also when I try to use it to turn the sound down, the touch sensitive button does not work anymore.

Any suggestions?

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Here is a link of a picture for the acer aspire 6930g. The sound control is below Dolby Home theater.