Amazon Fire TV User Manual page 20

Tips:
Document Update: 2014-04-02
Document ID: FTUG-2611-100

For optimal wireless performance, do not place your Amazon Fire TV in an enclosed
cabinet, as it impacts signal strength to the device, remote, and game controllers.

If you are switching from a wired to a wireless connection, disconnect the Ethernet
cable from your Amazon Fire TV device before switching to a wireless connection.
Amazon Fire TV User Guide
Set Up Amazon Fire TV
16