Bro you are not the only one. Even I am noticing the same issue on my S9+. I have a dual band router with 2.4G & 5G. Everything works fine if I connect to 2.4G SSID but it is opposite if I connect to 5G SSID. For now I am using 2.4G and waiting for Samsung fix. Not only that I face below two major issues 1. Call drops frequently and person at the other end says can't hear me for a while. I am sure it is a software issue which needs a fix. 2. Black Crush issue if I watch videos in dark. Again this is a software issue which needs a fix. Eagerly waiting for update from Samsung with all these fixes. I am really p****d off with Samsung after buying S9+. All issues which I have reported are major that makes me unhappy. I really don't know why they want to announce a new device without enough testing in different conditions.
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