Yes, same issue with WIFI since the last iOS update. I've had this issue on my iPhone SE (2020) since installing IOS 14. (the phone says IOS 14.0.1 is also installed.) No issues with IOS 13, then suddenly poor WIFI signal and frequent disconnections or no-ping error messages. I'm frequently checking for a new update to fix this bug, but I continuously get an 'unable to connect' error even while checking for the update. It seems I need to be on wifi to check for, or get a system update when available for this bug, but the wifi is now too unstable to do that. Quite the conundrum.