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I have a laptop running Ubuntu 12.04. Everything used to work perfectly but currently I am having network problem.

If I restart network-manager, I could ping my router and google.com no problem, bittorrent still works.

Once I open a browser and load a website, the laptop network will no longer work. I can't even ping my router anymore. I need to restart network-manager then I can ping again. Nevertheless, the problem will happen again when I load a website.

Any idea what is causing this problem?

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