Comment 36 for bug 941695

Hm, still looking for a pattern and while I was at it I have tried the cw-3.3 and this results in an connectivity issue and stays like it until a reboot. No messages at all, just nothing. I can't get out of this by reconnecting this time either.There's no longer a crash with this version so there is some progress.

using the following to get cw-3.3

linux-backports-modules-cw-3.3-3.2.0-18-generic:
  Installed: 3.2.0-18.1
  Candidate: 3.2.0-18.1
  Version table:
 *** 3.2.0-18.1 0
        500 http://gb.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
        100 /var/lib/dpkg/status

I hope this helps.