Comment 6 for bug 1046912

After some investigation, there have been other users of different laptop manufacturers running into similar issues:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/984552
http://bugzilla.intellinuxwireless.org/show_bug.cgi?id=2368

If you still are running into this issue, could you try the following:
sudo modprobe -r iwlwifi
sudo modprobe iwlwifi 11n_disable=1

If that works, then for a temporary solution, you could add the following to make this persistent:
sudo sh -c 'echo "options iwlwifi 11n_disable=1" > /etc/modprobe.d/iwlwifi.conf'