Model: iPhone 8 plus IOS: The latest I am having the same issue. Especially, when I am on video calls, audio calls (via wifi), whatsapp, facetime etc... whenever I use any of them, my wifi connection drops off of my iPhone, and continues on the LTE. I reset my network settings, and I don't use VPN or any other protocols. This is always an issue with iPhones for the past 3-4 years. So annoying... Apple, please fix this and make wifi connection feature stable. it is 2021...****... :)