Step 1– From the left or right side, press and hold the power button (depending on the smartphone model)
Step 2– On this screen, you'll see three options: Switch Off, Restart, and Emergency mode. Restart or reboot the computer by clicking the Restart or reboot button. You can also choose to turn off the power.
Step 3– Your phone's screen will appear after a few moments. If you opted to turn off your phone, wait a few seconds and then hit the power button to restart it.
Step 4– Once the phone has restarted, open the YouTube app and try to play any video you were trying to play previously. This should now function properly.