Just got a new S9 Plus but the wifi speed is very slow. I normally get 200+ Mb/s on my 5 GHz channel using my iPhone or my PC. The Galaxy Plus only achieves 40 or so Mb/s. It appears to be running at 2.4 GHz speed at both 2.4 and 5 GHz. When I connect in settings, the phone states the speed checked out at 351 Mb/s but the actual speed is as stated above. I've checked my router and it all looks OK and runs at the higher speed for other devices. Samsung chat support just advised me that it was my ISP! Any ideas please?
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