Some iPhone 15 owners began to complain about Wi-Fi problems after updating to iOS 17.0.3.
The bottom line is that the Wi-Fi indicator itself can appear as if you are connected to a network. However, any content either does not load at all or does so extremely slowly.
In some cases, the error goes away on its own, and sometimes you need to restart Wi-Fi on the iPhone. Someone disconnects from the network every 45 seconds, while the smartphone itself continues to show an active connection.
It is noted that the error also occurs in some iPhone 14, but this is rather an exception to the rule.