100% happening to me on my XR on iOS 14.0.1 - connect to WiFi fine and then it randomly stops surfing the web so I have to disconnect and reconnect the WiFi. Happened on my XS as well and the wife’s iPhone 11. Was totally fine on iOS 13. Odd thing is that my iPad is fine in iOS 14. I saw that the latest iOS update had a WiFi fix but nothing different for me. Does not happen to other devices like my MacBook that has stable connection.