Weak Internet connection

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http://askubuntu.com – Connection to Internet stops when connected to wired Internet using network manager. Ubuntu 12.04. When I connect to Internet at the start it connects and works good for few minutes, after some time the connection drops down rapidly and when I manually disconnect the Internet and reconnect it again using network manager, my connection seems to be good after few seconds. But in Windows my connection works fine. Hardware Specs: 00:0f.0 Ethernet controller: NVIDIA Corporation MCP73 Ethernet (rev a2) (HowTos)