Support Not Vibrating after firmware update 4.1.2

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http://androidforums.com – Hi All, I'm using a Samsung Galaxy S2 on Australia Vodafone network. 2 weeks before, I have updated the os to the latest one 4.1.2. Couple of days after the update, I have noticed that the vibtation stops suddenly. But from last 4-5 days my phone is not vibrating at all. I have tried to fix the problem by changing the vibrating intensities and other options given in 'Settings-> Sounds' menu. Can anyone advice me regarding this issue ? Did the same thing happen to others ? Thanks in advance. Dinu. (General)