i have WiFi issues also. I have a regular s20 5g (sm-g981u1). my router is a smart rg sr 16ac. Crazy thing is that it knocks my laptop wifi off too. When I turn phone wifi off laptop internet comes right back. They both have independent connections to router and do not share wifi in any way. I read that it may be a mac address issue that you need to assign for the phone in the router but my ISP has my router administrator page locked down. waiting to contact them.
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