[arch-general] X logging me out.

Hi all. After a recent system update (5 days ago) I find that I'm getting automatically logged out of X anywhere between 5-10 minutes into a session after a boot. I can relogin and then remain logged in. Any ideas whats up? I don't have any special X configuration - none that I'm aware of.. No xorg.conf, etc. System is a Lenovo X61 with Intel graphics. Thanks.