I've been dealing with this problem for months now since I got the s20+, and have done all the requested attempts of rebooting phone, wifi, etc and nothing worked. I think I just figured out the problem as my phone had been working and not dropping the internet anymore. I found it by accident. Pull down the the screen to access the settings and select power mode. Uncheck limit CPU to 70% and accept. I'm sure it'll decrease the life of my charge, but so much better than constantly getting booted off my wifi, not to mention at work where I rely on being on wifi. FINALLY!! I hope this works for others and that's why I had to share!!
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