There's absolutely nothing in the event log related to the shut downs. The previous entries in the Event log were hours before the shut down.

After reinstalling the older version of SlimCenter the machine has not shut down. What I need to do now is see if I can find some type of crash note in a SlimCenter log file. I'm pretty confident it's what took the machine down since it was the only change I had made to any software in months.

Windows Update is disabled on this machine because I can't trust MS not to break something. And if it ain't broke, don't fix it.