Help!!! I'm facing this annoying problem everyday since I upgraded my Catalina to macOS Big Sur 11.0.1. The Wi-Fi is connected but with no Internet access after a while. The Wi-Fi has no problem in Catalina. Same here. No internet connectivity after a while, for a while, all common resets and fixes done. No success. Seems to be an OS issue.
@Apple please fix ASAP!