FWiW, my S6 connects to my Netgear Extender on 5G ch 153, extending the range of my new Comcast 5G/2.4G Arris modem-router, also to my SM-P605V and this tablet. The Arris router is now on 5G default ch 36, but I see no reason to move it. 5G is empty here. I did move the 2.4G channel to get away from some neighbors. I use the WiFi Analyzer app to sniff the neighborhood 2.4G before picking the channels I want to use. HTH. YMMV.
Sent from my SM-T230NU using Tapatalk