How to Fix iPhone 16 WiFi Keeps Disconnecting After iOS 26.1 Update

If your iPhone 16 keeps disconnecting from WiFi after the iOS 26.1 update, the issue may be caused by corrupted network settings, router compatibility problems, VPN conflicts, or a firmware bug introduced by the update. The problem usually shows up as random drops, stalled loading, slow reconnects, or apps refusing to stay online.

Go through the fixes below in order.

Fix #1: Restart your iPhone and router

Restart the iPhone 16 first, then unplug your router and modem for about 30 seconds before plugging them back in. This clears simple connection glitches on both sides.

Fix #2: Forget the WiFi network and reconnect

Go to Settings > Wi-Fi, tap the info icon next to your network, choose Forget This Network, then reconnect using the password. This clears broken saved network data.

Fix #3: Turn off WiFi Assist

Go to Settings > Cellular, scroll down, and disable Wi-Fi Assist temporarily. This feature can switch between WiFi and mobile data in a way that feels like repeated disconnections.

Fix #4: Disable VPN or security apps for testing

If you use a VPN, private DNS tool, or security app, turn it off temporarily and test WiFi again. Some of these apps break network stability after iOS updates until they are patched.

Fix #5: Reset network settings

Go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings. This removes saved WiFi networks, Bluetooth pairings, and cellular preferences, but often fixes stubborn disconnects quickly.

Fix #6: Check if the issue happens on one network only

Test another WiFi network if possible. If the issue only happens on one router, update the router firmware and check band steering, WPA settings, and mesh handoff behavior.

Fix #7: Update iOS and apps

Install any newer iOS patch and update all apps from the App Store. Apple and app developers often release follow-up fixes after a buggy rollout.

Fix #8: Reset all settings

If WiFi still disconnects after a network reset, go to Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings. This keeps your files but restores system settings to default.

Fix #9: Back up and reinstall iOS if needed

If the problem remains severe across multiple networks, back up the phone and reinstall iOS using Finder on a Mac or iTunes on Windows. This is more thorough than a normal update.

Related iPhone 16 fixes

If your iPhone 16 WiFi keeps disconnecting after iOS 26.1, forgetting the network, turning off WiFi Assist, and resetting network settings are the three fixes most likely to solve it.