Hello Gandalf's father,
We suggest that you run the Power Troubleshooter:
- Click Start and type Troubleshooting in the search bar.
- Select Troubleshoot.
- Click Power.
- Click Run the troubleshooter.
You may also perform a clean boot. This starts Windows by using a minimal set of drivers and startup programs. To perform a clean boot, please click on this link.
Feel free to post back if you have any concerns.