Asus routers tend to not play nicely with Samsung devices unfortunately, I have an asus router as well and I have had multiple samsung devices that are unable to maintain a stable connection as well. Something that I have done to make it less anno...
Mine stays off I don't have to keep switching it. I keep mine off because apparently samsungs are finicky with ASUS routers. :/
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Exact same issue here, wish I had something for you :(
So I don't know how or why but I just restored my phone twice in a row and it's fine now. Why did I do it twice? Because the first restore caused the phone to lag and the fingerprint...