Now, I have  updated the BIOS version to latest one:

    sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
    83ET76WW (1.46 )
    07/05/2013

I have run the above command showing the BIOS verison. Problem still
persist.

In addiditon to this I have updated kernel version to 3.16.x but no luck
here as well.

** Changed in: linux (Ubuntu)
       Status: Expired => New

** Summary changed:

- Random Freezing problem
+ Random Freezing problem with Ubuntu 14.04 LTS, Lenovo Laptop T420

** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1457350

Title:
  Random Freezing problem with Ubuntu 14.04 LTS, Lenovo Laptop T420

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