Reboot your Chromecast device Make sure your mobile device or tablet is connected to the same Wi-Fi as your Chromecast device.
Open the Google Home app.
Tap the icon of the Chromecast you want to reboot.
Tap Settings More settings Reboot.
Tap Reboot again to confirm your choice.
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With the Chromecast Voice Remote
In the upper right of your TV screen, select your profile and then Settings .
Select System and then About and then Factory Reset.
From the Chromecast device
While the Chromecast is plugged into the TV and powered, press then hold the button on the back of the Chromecast. The LED should start to blink yellow.
When the LED light turns solid white, release the button, and the Chromecast should then reset.
Regards, Will Joe