When I’m home with my wi-fi router working fine as I can see on my computer, my cell phone often/usually won’t connect. So I go to settings, tap, it says its connecting to my wi-fi, then says “Saved”. So I tap again, and it tries and then goes back to “Saved”, usually by the 3rd or 4th try it Connects. But sometimes before that it downloads something - sometimes a lot (e.g. 100 MB.)
I’ll read some of the links in this article to see if I can get some tips.