Logs out automatically for some reason

I’m running a Linux Mint with a manually updated 3.2.6 kernel and Gnome 2.32.2 on a Core Duo. Anyone know how to prevent automatic logout at random!

Mar 31 22:23:21 rv-Aspire-5600 kernel: 8724.064235] ata1.01: status: { DRDY }
Mar 31 22:23:26 rv-Aspire-5600 kernel: 8729.104077] ata1: link is slow to respond, please be patient (ready=0)
Mar 31 22:23:31 rv-Aspire-5600 kernel: 8734.112130] ata1: device not ready (errno=-16), forcing hardreset
Mar 31 22:23:31 rv-Aspire-5600 kernel: 8734.112151] ata1: soft resetting link
Mar 31 22:23:32 rv-Aspire-5600 kernel: 8734.320598] ata1.00: configured for UDMA/100
Mar 31 22:23:32 rv-Aspire-5600 kernel: 8734.360455] ata1.01: configured for UDMA/33
Mar 31 22:23:32 rv-Aspire-5600 kernel: 8734.368529] ata1: EH complete
Mar 31 22:26:07 rv-Aspire-5600 kernel: 8890.084270] ata1.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
Mar 31 22:26:07 rv-Aspire-5600 kernel: 8890.084286] sr 0:0:1:0: CDB: Get event status notification: 4a 01 00 00 10 00 00 00 08 00
Mar 31 22:26:07 rv-Aspire-5600 kernel: 8890.084329] ata1.01: cmd a0/00:00:00:08:00/00:00:00:00:00/b0 tag 0 pio 16392 in
Mar 31 22:26:07 rv-Aspire-5600 kernel: 8890.084334] res 40/00:03:00:00:00/00:00:00:00:00/b0 Emask 0x4 (timeout)
Mar 31 22:26:07 rv-Aspire-5600 kernel: 8890.084344] ata1.01: status: { DRDY }
Mar 31 22:26:12 rv-Aspire-5600 kernel: 8895.124078] ata1: link is slow to respond, please be patient (ready=0)
Mar 31 22:26:17 rv-Aspire-5600 kernel: 8900.140070] ata1: device not ready (errno=-16), forcing hardreset
Mar 31 22:26:17 rv-Aspire-5600 kernel: 8900.140092] ata1: soft resetting link
Mar 31 22:26:18 rv-Aspire-5600 kernel: 8900.344659] ata1.00: configured for UDMA/100
Mar 31 22:26:18 rv-Aspire-5600 kernel: 8900.379428] ata1.01: configured for UDMA/33
Mar 31 22:26:18 rv-Aspire-5600 kernel: 8900.384543] ata1: EH complete
Mar 31 22:44:39 rv-Aspire-5600 gdm-simple-slave[2543]: WARNING: Unable to load file ‘/etc/gdm/custom.conf’: No such file or directory
Mar 31 22:44:39 rv-Aspire-5600 acpid: client connected from 2545[0:0]
Mar 31 22:44:39 rv-Aspire-5600 acpid: 1 client rule loaded
Mar 31 22:44:42 rv-Aspire-5600 gdm-session-worker[2587]: WARNING: Unable to load file ‘/etc/gdm/custom.conf’: No such file or directory
Mar 31 22:44:42 rv-Aspire-5600 rtkit-daemon[1703]: Successfully made thread 2592 of process 2592 (n/a) owned by ‘106’ high priority at nice level -11.
Mar 31 22:44:42 rv-Aspire-5600 rtkit-daemon[1703]: Supervising 1 threads of 1 processes of 1 users.
Mar 31 22:44:43 rv-Aspire-5600 rtkit-daemon[1703]: Successfully made thread 2599 of process 2592 (n/a) owned by ‘106’ RT at priority 5.
Mar 31 22:44:43 rv-Aspire-5600 rtkit-daemon[1703]: Supervising 2 threads of 1 processes of 1 users.
Mar 31 22:44:43 rv-Aspire-5600 rtkit-daemon[1703]: Successfully made thread 2600 of process 2592 (n/a) owned by ‘106’ RT at priority 5.
Mar 31 22:44:43 rv-Aspire-5600 rtkit-daemon[1703]: Supervising 3 threads of 1 processes of 1 users.
Mar 31 22:44:43 rv-Aspire-5600 gdm-simple-greeter[2584]: Gtk-WARNING: /build/buildd/gtk+2.0-2.24.4/gtk/gtkwidget.c:5687: widget not within a GtkWindow
Mar 31 22:44:43 rv-Aspire-5600 gdm-simple-greeter[2584]: WARNING: Unable to load CK history: no seat-id found
Mar 31 22:44:46 rv-Aspire-5600 gdm-session-worker[2587]: GLib-GObject-CRITICAL: g_value_get_boolean: assertion `G_VALUE_HOLDS_BOOLEAN (value)’ failed
Mar 31 22:45:00 rv-Aspire-5600 gdm-session-worker[2587]: pam_sm_authenticate: Called
Mar 31 22:45:00 rv-Aspire-5600 gdm-session-worker[2587]: pam_sm_authenticate: username = [rv]
Mar 31 22:45:00 rv-Aspire-5600 gdm-session-worker[2610]: Passphrase file wrapped
Mar 31 22:45:05 rv-Aspire-5600 rtkit-daemon[1703]: Successfully made thread 2704 of process 2704 (n/a) owned by ‘1000’ high priority at nice level -11.
Mar 31 22:45:05 rv-Aspire-5600 rtkit-daemon[1703]: Supervising 4 threads of 2 processes of 2 users.
Mar 31 22:45:05 rv-Aspire-5600 pulseaudio[2704]: pid.c: Stale PID file, overwriting.
Mar 31 22:45:06 rv-Aspire-5600 rtkit-daemon[1703]: Successfully made thread 2714 of process 2704 (n/a) owned by ‘1000’ RT at priority 5.
Mar 31 22:45:06 rv-Aspire-5600 rtkit-daemon[1703]: Supervising 5 threads of 2 processes of 2 users.
Mar 31 22:45:06 rv-Aspire-5600 rtkit-daemon[1703]: Successfully made thread 2715 of process 2704 (n/a) owned by ‘1000’ RT at priority 5.
Mar 31 22:45:06 rv-Aspire-5600 rtkit-daemon[1703]: Supervising 6 threads of 2 processes of 2 users.
Mar 31 22:45:07 rv-Aspire-5600 nautilus: [N-A] Nautilus-Actions Menu Extender 3.0.5 initializing…
Mar 31 22:45:08 rv-Aspire-5600 nautilus: [N-A] Nautilus-Actions Tracker 3.0.5 initializing…
Mar 31 22:46:54 rv-Aspire-5600 kernel: [10136.167149] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro,commit=600

Probably a question you should as at the Mint Forum