Same problem here on a Toshiba Portege laptop with the same adapter:
02:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or AGN
[Kedron] Network Connection (rev 61)
Subsystem: Intel Corporation PRO/Wireless 4965 AG or AGN
Kernel driver in use: iwlagn
Kernel modules: iwlagn
I've upgraded from lts (10.04) so I didn't experience this bug before.
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https://bugs.launchpad.net/bugs/779159
Title:
[regression] after update to 11.04 wireless lan interruptions and
Microcode SW error detected. Restarting 0x82000000
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