im using 5ghz only and i turned off the 2.4ghz channel why on my router shows that thers is 2 signal is connected from the extender but only one device ? for exaple : on my router app it show that the

good day, i'm connecting the console from the tp link extender RE650 through ethernet, once i connect it i test the speed and it fine but after couple of minutes the speed is decreasing and i dont kno