By john 
A wireless connection that drops every few minutes turns an iPhone into a frustrating device. Since iOS 18 arrived, plenty of users have found their previously stable home network suddenly unreliable, with the phone falling back to cellular data and quietly burning through an allowance. The causes are usually a mismatch between rajaong new network behaviour and an older router.
What Is Likely Causing It
- Private Wi-Fi Address rotates the phone’s identifier, and some routers with device-based rules handle this badly.
- iOS 18 prefers certain band and security combinations, and a router advertising mixed settings can confuse the handoff.
- An outdated router firmware version may not support features the phone now expects.
- Wi-Fi Assist automatically switches to cellular when the signal weakens, which looks like a disconnection.
- A VPN or content filtering profile can interfere with the connection handshake, dropping the link at intervals that look like a router problem.
First Steps to Try
- Toggle Wi-Fi off and on from Settings rather than Control Centre, which only disconnects temporarily.
- Restart both the iPhone and the router, unplugging the router for thirty seconds.
- Open Settings, Wi-Fi, tap the info button next to your network, and turn Private Wi-Fi Address off as a test.
- Forget the network and reconnect, entering the password fresh.
- Test the phone on a different Wi-Fi network such as a friend’s or a cafe’s, which immediately tells you whether the phone or the router is at fault.
If the Problem Persists
- Check for a router firmware update through its admin interface or companion app.
- Split the 2.4 GHz and 5 GHz bands into separate network names if your router combines them, then connect to one deliberately.
- Turn off Wi-Fi Assist under Settings, Cellular, at the bottom of the list, to stop silent switching.
- Reset network settings from Settings, General, Transfer or Reset iPhone, which clears saved networks and VPN configurations.
- Turn off any VPN and check Settings, General, VPN and Device Management for profiles that might be filtering traffic silently.
Safety and Data Warnings
Resetting network settings erases every saved Wi-Fi password, so have them available before you start. Turning off Private Wi-Fi Address permanently makes your device trackable across networks, so treat it as a diagnostic step and re-enable it on public networks. Never enter a Wi-Fi password on a network you do not recognise.
Conclusion
Post-update Wi-Fi instability is usually a conversation between the phone and an ageing router that has stopped going smoothly. Test private address, update router firmware, and split the bands. If the phone connects reliably to other networks, the router is the piece that needs attention rather than the phone.