Wired connection not working (unplugged) help?

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http://askubuntu.com – I configured the pppoe connection in network manager it works perfectly fine when i start my computer after some couple of hours/min the network gets disconnected. When i check the network manager it says wired connection unplugged so when i restart it works fine again. Can anybody help because I dont want to restart my pc again and again . (HowTos)