It’s generally good thing to reset the Amazon Fire TV by disconnecting the Fire TV and again reconnecting that through the power cord. If you will check the Amazon’s troubleshooting page(Link 1), you will see that this is the first thing listed there. For further (detailed) information on this: Amazon Fire Stick Customer Service Number.
If you need still want more control on your devices on of situation so you just need to restart the device by pressing the “Select” and “Play” button on the remote for a few seconds after that you will get the reboot message on the screen.
Amazon Fire Stick Customer Service Number
If you got the problem fixed so do not forget to mention about our Amazon Fire Stick customer support number. If you ever need any kind of solution for Amazon Fire Stick, you can directly reach us.