The Wi-Fi signal was poor, and as I and others assumed it removed the nasty rays while it was working, it was not good.
I have cameras working on Wi-Fi and switching off at night is not an option.
I gave it away!
Reply from JRS: When other wifi networks are in the area, for example neighbouring wireless routers or other wireless transmitters working on the same wifi frequency as the Eco-wifi router, interference may occur which causes these problems. In most cases the solution is to set the Eco-wifi router to another channel. Read more at Troubleshooting: Devices cannot find the Eco-wifi network, connection drops or slow connection.