Wireless Networking stops abruptly and works again for sometime after restart?

[nsteja1]

I have been working on Ubuntu (12.04) for ages now but all of a sudden I have been facing this problem for two weeks now.

I start my laptop, ubuntu connects to a wireless network and I browse for a couple of minutes on Chrome and all of a sudden the network stops responding - it shows "Resolving host" or "Connecting..." and nothing comes up. I cannot even ping any other machine or do an "nslookup" - everything fails. The wireless is still connected to AP but everything stops responding.

I have to put the system to sleep and open it again to browse for another couple of minutes and then this happens again.
Any help on this is appreciated! It has been a great pain for weeks now.

[tfrue]

Unplug the router, let it sit for a bit, then plug it back in and try that on for size.

If that doesn't help, will you post the output of the commands:

sudo nm-tool

cat /etc/network/interfaces

dmesg | grep wlan

ifconfig -a

Please and thank you!