Hi KimD,
Thank you for posting your query in Microsoft Community.
I understand your concern and I appreciate the troubleshooting steps you have tried. I suggest you to Run the Power Troubleshooter and check if it helps.
Power troubleshooter will automatically fix some common issues with Power Plans. Run the Power troubleshooter to adjust your computer's power settings. The Power troubleshooter checks things like your computer's timeout settings, which determine how long the computer waits before turning off the monitor display or entering sleep mode. Adjusting these settings can help you conserve power and extend your computer's battery life.
- Press Windows key + W and type Troubleshooting.
- Select Troubleshooting and click on System and Security.
- Click on Power and follow the onscreen steps.
Delete the current power plan and create it again. Refer to the following link to change the power plan to suit your needs.
Refer to the section: How to create and delete a power plan.
http://windows.microsoft.com/en-US/windows-8/power-plans-faq
Hope this helps in resolving the issue. If the issue persists, do get back to us. We will be happy to assist you.