Screen relocks shortly after unlock

[Chris]

With Ubuntu 14.04 beta 2 (with all recent apt-get upgrades), I am having trouble with the screen lock.

If I lock the screen manually (ctrl+alt+l) and then unlock the screen after a few seconds everything is fine.

If I leave the computer sitting for a while (maybe at least an hour? sometimes over night), when I unlock the screen it relocks the screen again after only a handful of seconds. I am typically typing in a window or using the mouse when the relock happens.

This has occurred three or four times so far. I'll try to pay more attention to exactly what I am doing, but I can't seem to make it happen when lock the screen for just a short period of time.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-desktop 1.324
ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
Uname: Linux 3.13.0-19-generic x86_64
ApportVersion: 2.14.1-0ubuntu1
Architecture: amd64
Date: Sat Apr 5 10:56:00 2014
InstallationDate: Installed on 2014-04-02 (3 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-meta
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.