I have a similar problem.

Jul  2 10:40:49 beyond-laptop kernel: [  303.160468] iwlagn: Microcode SW error 
detected.  Restarting 0x2000000.
Jul  2 10:40:49 beyond-laptop kernel: [  303.179097] iwlagn: MAC is in deep 
sleep!
Jul  2 10:40:49 beyond-laptop kernel: [  303.712292] Registered led device: 
iwl-phy0:radio
Jul  2 10:40:49 beyond-laptop kernel: [  303.712304] Registered led device: 
iwl-phy0:assoc
Jul  2 10:40:49 beyond-laptop kernel: [  303.712315] Registered led device: 
iwl-phy0:RX
Jul  2 10:40:49 beyond-laptop kernel: [  303.712325] Registered led device: 
iwl-phy0:TX

Card:
03:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or AGN 
[Kedron] Network Connection (rev 61)

uname -a:
Linux beyond-laptop 2.6.28-13-generic #45-Ubuntu SMP Tue Jun 30 22:12:12 UTC 
2009 x86_64 GNU/Linux

When?
After unplugging the power cable of my T61p and closing the laptop. When I 
reopen it the current data transfer is interupted and the network does not 
response anymore.
When I don't have a data transfer running everything is ok.

hope it helps,
best,
cue

-- 
Intel WiFi 4965 has "Microcode SW Error" after 1.5gb data transfer or when 
display is turned off during data transfer.
https://bugs.launchpad.net/bugs/336104
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