Same problems (even worth)  for my Thinkpad T60 2007CB5 (Intel 3945abg).

1, freeze a lot while using network-manager (every 2-5 minutes with WIFI on, 
never with WIFI off)
2, freeze every 10-20 minutes while using WICD1.62 with the default WPA 
supplier 
  2.1 By checking log iw event -t, will reconnect every 60-75 seconds. 
(deauthenticated (Reason: 3))
  2.2 Before freezing, there are some log as(now frozen, has to type it out):
       [813. 069493] e1000e 0000:02:00.0 irq 20 for MSI/MSI-X 
       [813. 125177] e1000e 0000:02:00.0 irq 20 for MSI/MSI-X 
       [813. 126030] ADDRCONF(NETDEV_UP): eth0:link is not ready
....  
       [813. 757091] ADDRCONF(NETDEV_UP): wlan0:link is not ready

-- 
[Karmic] Intel Pro/Wireless 3945BG (driver: iwl3945) disconnects frequently at 
random
https://bugs.launchpad.net/bugs/429035
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