As suggested by https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/993187/comments/91 I now run kernel 3.3.6 and so far i've not experienced any freezes after the upgrade.
As suggested by https:/ /bugs.launchpad .net/ubuntu/ +source/ xorg/+bug/ 993187/ comments/ 91 I now run kernel 3.3.6 and so far i've not experienced any freezes after the upgrade.