I installed Ubuntu 14.04 on my brand new laptop and got this annoying behavior: wireless connection works fine the first minutes and then it just stops working at all. Network manager says it is still connected, other devices works properly and ifconfig has a normal output. I have to reboot and after it Internet starts working fine again, at least for some minutes.
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This might help :Wireless networking not working after resume in Ubuntu 14.04
It contains many command line commands that might help

Ossama Nasser
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lshw -C network
into your question. – Wilf Oct 18 '14 at 11:48