Hi ski-bum,
I see you are using the latest Intel Rapid Storage software installed on the computer and I am afraid I do not have issues reported with the latest version similar to your computer problem.
Most of the issues when computer does not shut down and restart are associated to power supplies. Please test the rapid storage software by uninstalling the application and check if your computer will power down without Intel Rapid Storage installed.
Also, you need to check with your motherboard maker for different rapid storage version that might be customized for your motherboard model.
Thanks
Allan