The main sources of this issue are the distance between the controller and the fire stick, obstructions, poor connection, VPN settings, hardware damage, and internal or external damage to the Fire Stick. 

Why Does This Problem Occur?

This problem develops mostly because of:

Solutions

Summing it up

Will my Fire Stick work with Ethernet?

Yes.

How do I disconnect my network connection and then reconnect?

Select “Forget”.  Re-enter your login credentials again to reconnect.

How do I get rid of the Fire Stick message “not in range”?

Try restarting your Fire Stick if you want a quick solution.