Google Nexus 4 volume help

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http://forums.androidcentral.com – I am using nexus 4 for the past 5 months and it is working fine. My recent observation is that the speaker volume is not coming to minimum even the volume down button is pressed. I am embrassed with this and people nearby can here the conversation. Even valume bar os not coming to zero when the volueme button is pressed.Is this a software problem or hardware problem. How to over come this? Murali krishna (HowTos)