Wifi gets automatically disabled in Ubuntu 12.04 Gnome Classic

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http://askubuntu.com – I am using a HP dv2000 series laptop. I have a broadcom 802.11g wireless apapter installed on the machine. While surfing the internet in Ubuntu 12.04, sometimes the Wifi gets disabled automatically. (sudo rfkill list shows that Wlan is hard locked). I have tried commands like sudo rfkill unblock all But the hard lock still remains. I have to always restart my laptop to get the Wifi working again. Any solutions to this problem? (HowTos)