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The article below may be able to help you with this.
Click on the link to see more details and screenshots.
See page 31 of the Apple TV User Gide
You can reset all of the settings on your Apple TV to factory values.
Important: This requires you to reenter all of your network and account
To reset all settings:
Choose Settings > General > Reset > Reset All Settings.
If you still have trouble, try resetting your equipment by disconnecting Apple TV, your TV, your wireless networking equipment or base station, and your router from the power outlet. Wait 30 seconds, and then reconnect everything.
It also may be helpful to switch between a wired and wireless network:
I hope this helps …