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I connect to the internet via wifi for several minutes, and then it disconnects without telling me anything (the image of internet connections says I am still connected). I have to click in my wireless network to connect again for a small period of time.

When I use another computer with Windows my internet never turns off. I believe I have used this computer with other wireless networks and the internet never shuts down. But also I have had the same problem with other wireless networks.

I have to say that I do not have much experience with network connections. Thanks for the support Ubuntu community.

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please include result of lspci , lshw -c network & lsmod – Web-E May 2 '13 at 17:15
also post the output of tail /var/log/syslog after your next disconnect – dward May 2 '13 at 18:51

I just posted a similar issue - see WiFi issues after upgrade to 13.04 from 12.10 - HP Envy dv6 quad core with ra2800pci... seems like a recurring issue with 13.04 with wifi...

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I was able to work around by booting with an older kernel.. during boot, hold down the ESC key and then under advanced select a 3.5.0-xx kernel instead of the default 3.8.x kernel – Prashant Nayak May 3 '13 at 3:04

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