According to /var/log/messages, systemd thinks the system is going down for a shutdown or reboot:

Apr 8 08:38:12 monster systemd[52873]: Stopped target Default. Apr 8 08:38:12 monster systemd[52873]: Stopped target Basic System. Apr 8 08:38:12 monster systemd[52873]: Stopped target Sockets. Apr 8 08:38:12 monster systemd[52873]: Closed Multimedia System. Apr 8 08:38:12 monster systemd[52873]: Closed D-Bus User Message Bus Socket. Apr 8 08:38:12 monster systemd[52873]: Stopped target Timers. Apr 8 08:38:12 monster systemd[52873]: Stopped target Paths. Apr 8 08:38:12 monster systemd[52873]: Reached target Shutdown. Apr 8 08:38:12 monster systemd[52873]: Starting Exit the Session… Apr 8 08:38:12 monster systemd[52873]: Received SIGRTMIN+24 from PID 52890 (kill). Apr 8 08:38:12 monster systemd[1]: Stopped User Manager for UID 0. Apr 8 08:38:12 monster systemd[1]: Stopping User Runtime Directory /run/user/0… Apr 8 08:38:12 monster systemd[1]: Stopped User Runtime Directory /run/user/ 0. Apr 8 08:38:12 monster systemd[1]: Removed slice User Slice of UID 0.

That was completely made up:

[root@monster ~]# w 08:42:33 up 1 day, 23:30, 1 user, load average: 0.54, 0.53, 0.37

greping /var/log/messages, this is spammed every few minutes:

Apr 8 08:10:12 monster systemd[52274]: Stopped target Default. Apr 8 08:13:12 monster systemd[52316]: Stopped target Default. Apr 8 08:15:16 monster systemd[52372]: Stopped target Default. Apr 8 08:18:12 monster systemd[52420]: Stopped target Default. Apr 8 08:23:12 monster systemd[52486]: Stopped target Default. Apr 8 08:25:16 monster systemd[52530]: Stopped target Default. Apr 8 08:28:12 monster systemd[52598]: Stopped target Default. Apr 8 08:33:12 monster systemd[52764]: Stopped target Default. Apr 8 08:35:16 monster systemd[52808]: Stopped target Default. Apr 8 08:38:12 monster systemd[52873]: Stopped target Default.

What in blazes is it doing?