You can use these steps to restart your Playstation 4

• Using the Playstation 4 controller, press and hold the Playstation button (located at the bottom/center of the controller) for 2 seconds. 
• The Playstation Quick Menu will appear. 
• From the Quick Menu, scroll down to the Power Menu. 
• From the Power Menu, you will see the option labeled Restart PS4.

Happy streaming!