galaxy s21 ultra not seeing my 5Ghz Wireless AC SSID being broadcast? I've tried messing with changing the frequency channels but nothing. It can see other 5Ghz wifi connections just not the one to my Netgear X10 aka R9000 Router. Had no issues with other Samsung devices picking up this frequency such as my Galaxy Tablet S5E and my Galaxy Note 10 Plus.
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Then comes the matter that phones are setup to do certain things only when they are plugged into the wall and into a wifi building, which obviously your phone is showing the symptoms of a reaction in this environment, yet you think it is something else?
Your feedback lacks specifics, as if you are guessing, and suspecting without substantiation but not attending.