Wired connection stops working suddenly

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http://askubuntu.com – I have Ubuntu 12.04. I was downloading something via Aria... and then it suddenly stopped. There was no connection to the Internet. I tried to ping the host but there was no reply. Also tried to ping the route but there was no reply. I got a message saying 'Ubuntu 12.04 has experienced internal error'. I restarted system but nothing was sorted out. The wired connection 'establishes' but I am not able to use Internet or ping either to host/route/ The wireless is working fine and it does connect to Internet. I have a static IP address for a wired connection and it connec (HowTos)