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Did you make any changes prior to the issue?
It could be due to change in system settings or corrupt power plan settings or conflict with any third party apps.
Try to run the Power Troubleshooter.
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.
1.Press Windows Logo Key+X then click on Search option.
3.Select Troubleshooting and click on
System and Security.
4.Click on Power and follow the onscreen steps.
Try to place the system in Clean Boot and check. This helps eliminate software conflicts that occur when you install a program or an update or when you run a program in Windows. It starts Windows by using a minimal set of drivers and startup programs.
1.Press Windows Logo Key+X. Click on Run.
2.Type msconfig. Click Ok.
3.Then follow the steps from 3-7 for Windows 8.1 in the link below.