I don't think I've seen this since this update over a month ago:
So it may have been fixed.
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
Xorg crashes with segfault
To manage notifications about this bug go to:
Mailing list: https://launchpad.net/~ubuntu-x-swat
Post to : firstname.lastname@example.org
Unsubscribe : https://launchpad.net/~ubuntu-x-swat
More help : https://help.launchpad.net/ListHelp