Returned the phone yesterday, and decided to get a new one in it's place. At Best Buy, they tested the phone, and it was dog slow on their WiFi, so no problems with the exchange. So far,my new S20 plus is doing great on my WiFi here at home. This morning, I got a download speed of about 120 MBPS, so I'm a happy camper. Thanks to all of you who chimed in with ideas for a fix!!
On Gayles problem with ISP's, we went through hell and back last year with our ISP. Speeds were great until 5 PM to 11 PM, then it became unusable. We couldn't even use youtube tv without it buffering all of the time. It was fine before 5 PM though, so it was driving me crazy. I know you loose some speed at peak times, but we were paying for 200, and getting around 10 at night. During the day, it was 200 or close to it. When calling, I always got a low level help desk person, who had to go through all of the troubleshooting steps. Usually about a 45 minute ordeal. After the 4th tech visit, they finally admitted the problem was on their end. The network was overloaded, and they had to "split a node", for the area. From my understanding, that takes an area, and makes it into two networks instead of one. The tech said everyone in the area was complaining, so I guess that finally helped. The whole ordeal took around 3 months to finally get fixed.
We talked to some neighbors, and found they were having the same problems, so they called also. Check with some people around you, and get them to call and complain if they are having problems. It could be the same type of thing. You have to figure all of the video streaming these days, and people working form home, has to be putting a strain on ISP's networks.