I'm having the same problem. It started after the most recent update from Samsung. I've determined it has nothing to do with my router or network and I've done everything recommended in various threads including Reset Network Settings, Forced Restart, and Clear Cache. Some of those actions resulted in connection to my network but it was never maintained for more than a few hours. then the original problem would repeat.
Prior to the last update, Searching for Available Networks would show 5 or 6 networks. Now it just shows one, my next-door neighbor's network. I just went through the usual routine and got connection to my network again only when my device was relatively close to my router. Logic would point to this last update causing some change to the range or sensitivity of the WiFi reception. I don't have a solution for this other than the obvious ones, upgrading or boosting the router. Would love to hear from others if you find another solution or identify a different causation.
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