My phone, Iphone 14 pro Max, switches off of Wi-Fi when I’m not using it and switches back on when I use it. Phone was working fine until updated to 16.3. I tried everything including reset networks settings but that didn't fixed the issue. Updated to 16.3.1 hoping it will get fix but the issue still persist. The only solution, temporary solution, is turning my phone off and on but it only works fine for about 3 days and then it happens again.
I called customer support already, they run a diagnostic on my phone and they said nothing is wrong. I read a lot of forms trying to find a solution and there is a lot of people talking about this issue. If its a software issue please fix it in the next update. it gets very annoying when I have to restart the phone every 2/3 days. Nothing is wrong with my WIFI or my modem. All my other devices, including my husband Samsung Note 20 don't have any issues with WIFI connectivity. I tried every listed solution and nothing fix the issue. Also I have 2 friends, iphone 13 pro and iphone 11, that are facing the same issue after 16.3 that means it is not just me.