Unplug your Echo, and your Router and any and all Wi-Fi appliances. Now plug in your Router and before you turn on any other equipment turn on Echo and see if it will setup. If it does, then the chances are you are up ip contention.
Now start from the beginning and turn on the most important appliance, then connect in priority of importance until all your system are operational.
Another suggestion is to shift the Echo to one side or the other.