I am seeing this bug and has been fighting it ever since upgrading to
Jaunty. I am now running latest Karmic alpha release with newest updates
and the problem persists.

It seems that the problem is most pronounced during high load on the
network (i.e. during downloading or flash video streaming), however, I
suspect that this is simply because it is more noticeable during high
load! As far as I can tell, the connection cuts out with exactly 30
minute intervals. About 30 seconds after, this message shows up in the
syslog:

Oct 15 00:09:01 localhost CRON[3987]: (root) CMD (  [ -x
/usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find
/var/lib/php5/ -type f -cmin +$(/usr/lib/php5/maxlifetime) -print0 |
xargs -n 200 -r -0 rm)

Besides that, my syslog is being spammed with:

Oct 15 00:16:07 localhost kernel: [ 5487.712146] Inbound IN=wlan0 OUT=
MAC= SRC=192.168.1.4 DST=192.168.1.255 LEN=242 TOS=0x00 PREC=0x00 TTL=64
ID=0 DF PROTO=UDP SPT=138 DPT=138 LEN=222

with random intervals, and:

Oct 15 00:15:22 localhost wpa_supplicant[1314]: CTRL-EVENT-SCAN-RESULTS

with exactly 120 seconds interval. I don't really think the later two
have anything to do with the bug, but I'm pretty much a novice, so I
included them, just for good measure.

Most of the time, the connection is reestablished by itself, but
sometimes I have to force it by removing the iwlagn module and reloading
it.

I have tried several different things:

- Tried alternatives to Network Manager, none of them helped
- Tried switching my router to WEP encryption, nothing changed
- Tried ndiswrapper, didn't work at all
- Tried installing Jaunty (and later Karmic) backports which made Ubuntu crash 
during boot
- Switched to a brand new router, same problem

Only remedy is to use a wired connection.

When running Vista, the connection works without a glitch, another
computer in my network running Hardy has been running rock steady for
over a year now with nothing resembling this. This computer worked fine
up until shortly after installing Jaunty (upgraded directly from Hardy
to Jaunty).

The system is a Acer Aspire 5920G, 2,0 GHz T7300 with the Intel 4965AGN
adapter.

-- 
Intel  PRO/Wireless 4965 AGN deactivates  
https://bugs.launchpad.net/bugs/216634
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