Description:
My Desktop freezes randomly (once a week).
If it freezes I'm still able to move the mouse.
Audio is working.
I can connect via ssh.
Reboot take about vastly longer than normally (via ssh)

I found the following in my dmesg.

[ 24.287092] saa7133[0]/alsa: saa7133[0] at 0xe8205000 irq 20 registered as card -1
[ 3332.175661] gvfsd-metadata[878]: segfault at 7fffc6f8ffb0 ip 00007f545cd07c25 sp 00007fffc6f8ffb0 error 6 in libc-2.17.so[7f545cc8e000+ 1a3000]
[ 3334.568344] systemd-journald[123]: Failed to write entry, ignoring: Argument list too long
[ 7837.263682] gvfsd-metadata[5120]: segfault at 7fff4b3f9fc0 ip 00007f10141cfc25 sp 00007fff4b3f9fc0 error 6 in libc-2.17.so[7f1014156000+ 1a3000]
[ 7839.461285] gvfsd-metadata[8118]: segfault at 7fffeca51ff8 ip 00007f505e5daebd sp 00007fffeca52000 error 6 in libc-2.17.so[7f505e560000+ 1a3000]
[ 7840.870096] systemd-journald[123]: Failed to write entry, ignoring: Argument list too long
[ 7842.388643] systemd-journald[123]: Failed to write entry, ignoring: Argument list too long
[25564.415518] do_IRQ: 0.181 No irq handler for vector (irq -1)

and in journalctl I found

Mai 02 19:45:24 michael-arch /etc/gdm/Xsession[707]: g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
Mai 02 19:45:24 michael-arch /etc/gdm/Xsession[707]: g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
Mai 02 19:45:24 michael-arch /etc/gdm/Xsession[707]: (deja-dup-monitor:902): GVFS-RemoteVolumeMonitor-WARNING **: Owner of volume monitor org.gtk.Private.UDisks2VolumeMonitor disconnected from the bus; removing drives/volumes/mounts
Mai 02 19:45:24 michael-arch /etc/gdm/Xsession[707]: evolution-shell-Message: Network disconnected. Forced offline.
Mai 02 19:45:25 michael-arch /etc/gdm/Xsession[707]: gnome-session[707]: WARNING: Client '/org/gnome/SessionManager/Client18' failed to reply before timeout
Mai 02 19:45:25 michael-arch /etc/gdm/Xsession[707]: gnome-session[707]: WARNING: Client '/org/gnome/SessionManager/Client5' failed to reply before timeout
Mai 02 19:45:25 michael-arch /etc/gdm/Xsession[707]: gnome-session[707]: WARNING: Client '/org/gnome/SessionManager/Client2' failed to reply before timeout
Mai 02 19:45:25 michael-arch gnome-session[707]: WARNING: Client '/org/gnome/SessionManager/Client18' failed to reply before timeout
Mai 02 19:45:25 michael-arch gnome-session[707]: WARNING: Client '/org/gnome/SessionManager/Client5' failed to reply before timeout
Mai 02 19:45:25 michael-arch gnome-session[707]: WARNING: Client '/org/gnome/SessionManager/Client2' failed to reply before timeout
Mai 02 19:45:25 michael-arch /etc/gdm/Xsession[707]: (tracker-miner-fs:901): GVFS-RemoteVolumeMonitor-WARNING **: Owner of volume monitor org.gtk.Private.UDisks2VolumeMonitor disconnected from the bus; removing drives/volumes/mounts
Mai 02 19:48:24 michael-arch /etc/gdm/Xsession[707]: g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
Mai 02 19:48:24 michael-arch /etc/gdm/Xsession[707]: gnome-session[707]: GConf-WARNING: Got Disconnected from DBus.
Mai 02 19:48:24 michael-arch gnome-session[707]: GConf-WARNING: Got Disconnected from DBus.
Mai 02 19:48:24 michael-arch /etc/gdm/Xsession[707]: Received signal:15->'Beendet'
Mai 02 19:48:24 michael-arch /etc/gdm/Xsession[707]: OK
^[[1;39m-- Reboot --^[[0m