The WiFi connection on my S8 plus us horrible. Anything I try to access takes a while just to load. The "loading circle" spins round and round. I checked my router setting and all is correct, running 2.4. My companion's IPhone 6, my Oneplus 3t, and S7 Edge, and a tablet all run super smooth and quick on WiFi, but I am not getting any such performance on my S8 plus. I have smart switch turned off, I have erased network and reentered, I have rebooted and nothing works. My 4g LTE is super fast. Weird.