I have a continuing problem with loosing the ability to make calls over WiFi despite it being turned on and having a good WiFi signal. I can connect it again if I do a reset of my WiFi, Bluetooth and mobile, but this is a total bore. It can, at times, be OK for a day or so but often turns off after about 24 hours. I restored my phone to factory settings but, once I managed to get the WiFi calling enabled, the problem has started again. I am not sure if it is just a problem with my phone or if anyone else has had this and managed to sort it. The phone is a Google Pixel 4a.