I've downgraded to the previous firmware and it's working so far (for
about 3-4 days in a row). Here is a short howto:

1) download the previous firmware version from 
http://intellinuxwireless.org/iwlwifi/downloads/iwlwifi-4965-ucode-228.57.2.23.tgz
2) rename your actual firmware /lib/firmware/iwlwifi-4965-2.ucode to something 
else (e.g. /lib/firmware/iwlwifi-4965-2.ucode.copy), just in case ...
3) unpack the tar and copy the firmware iwlwifi-4965-2.ucode into 
/lib/firmware/iwlwifi-4965-2.ucode
4) restart the wireless module:
  sudo rmmod iwlagn
  sudo modprobe iwlagn
5) check that the new firmware has been successfully loaded:
  dmesg | grep firmware
  [105935.317633] iwlagn 0000:02:00.0: loaded firmware version 228.57.2.23

Cheers

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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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