My wife’s iPhone 11 and iPad Pro 10.5 2017 both have random wifi disconnects and receive a pop up that WiFi is unavailable. All my other (newer) iOS devices stay connected and do not exhibit the behavior at all. The issues started with the arrival of iOS 16.3 on her devices. We tried executing “Reset all network settings” on both of her devices to no avail.
unlike you, it’s possible to reconnect to the same Wi-Fi network right after the pop up. We use an Aruba AP22 access point in line of sight, interference is not an issue given all other devices stay connected. I disabled wifi 6 on the AP to see if that helped, but no… it did not. The disconnects happen 2 sometimes 3 times a day.
Havent tried a full software iOS reset yet… as that is usually very inconvenient. Just wondering if anyone else has these issues? Maybe solved?