Hi. recently bought a four pack of S500 Light switchs S/N Y257397X00961. Previoulsy I had purchase S515 kit and based on it's outstanding performance I purchased thers. I have isatalled all four and none of them will connect to WiFi. My phne, a Samsum 24, can see them and when I choose the one I want to setup the phone connect to the switches tempory network but that's as far as I can get. It returns a message that it cannot find the device. The S515 had no trouble at all but these simply will not connect. I am using a TPlink mesh router. Any ideas would be greatly appreciiated. I'm sure that The switches are not at fautly and the router certainly is working so I must be doing something wrong.