Using iPhone SE 2020, with iOS 14.3... I connect to the WiFi no probs, yet after a while it disconnects and will not re-connect. I go into air-plane mode and out, shut down wifi, start wifi up... 15mins later I'm connected back as if nothing was wrong. At first I just thought this was some sort of internet outage until I realised my phone was dropping off WiFi. I have 3 Velop's within 20 feet of each other in a mesh configuration with 5G and 2.4G enabled. I've had my iPad now since 2017 since I've upgraded to 14.3 I've now noticed it too will have WiFi issues now and then. My iPhone though it's more predominantly occurring.
Apple maybe a 14.3.1 (make WiFi reliable....) patch.