Hardware encryption seems to improve stability for the iwl3945 module.

put
    options iwl3945 hwcrypto=1
in a file in /etc/modutils.d (ex create a file called iwl3945)

With default software-crypto my test-computer would hang randomly after
transmitting anywhere between a few MB up to 1 or 2 GB. With hardware-
crypto enabled I just completed a test-transfer of 40GB+

-- 
ipw3945 hangs intermittently on Thinkpad T61
https://bugs.launchpad.net/bugs/141396
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