Iphone doesn't reconnect to wi-fi after screen shut down

Hello deanfromsan jose,

Thanks for choosing the Apple Support Communities. We see you are having trouble reconnecting to Wi-Fi after waking your iPhone. Check the steps out below.

If your iPhone or iPad won't connect to a Wi-Fi network - Apple Support

"Make sure that your router is on and that you're within range

If you're too far from your Wi-Fi router, you can't get a signal, so make sure that you're within range.

Make sure that Wi-Fi is on and that you can see your network

Go to Settings > Wi-Fi and make sure that Wi-Fi is on. Tap the name of your Wi-Fi network to join. A blue checkmark beside a network name means that you're connected.

If you see Auto Join disabled under Settings > Wi-Fi > [Your Network], tap the More Info button and then tap Auto-Join.

If asked, enter your Wi-Fi password

If asked, enter the password for your Wi-Fi network. Get help if you don't know your password.

Even if you enter the correct password, you might see an "unable to join the network" message or an "incorrect password" message. Restart all of your devices, then try to enter your password again.

Check for issues with your Wi-Fi network

If iOS or iPadOS detects an issue with your Wi-Fi connection, you might see a Wi-Fi recommendation under the name of the Wi-Fi network that you're connected to. For example, you might see the alert "No Internet Connection." To get more information, tap the Wi-Fi network.

Check your cables and connections

If you still can't connect to your network or get online, make sure that your router is connected to the modem and turned on.

Restart

Restart your iOS or iPadOS device.

Restart your router and cable or DSL modem by unplugging the device and then plugging it back in.

After you restart each device, see if you fixed the issue.

Reset your network settings

If you're using iOS or iPadOS 15 or later, tap Settings > General > Transfer or Reset [Device] > Reset > Reset Network Settings.

If you're using iOS or iPadOS 14 or earlier, tap Settings > General > Reset > Reset Network Settings.

This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before.

Get more help

• If you're connected to a Wi-Fi network but you can’t get online, try to use your Wi-Fi network on other devices. If you can't get online using your other devices, there might be a service outage. Call your cable company or internet provider for help.
• Try connecting to a Wi-Fi network in a different location. If your device can connect, you need to get help with your Wi-Fi network. If your device can't connect to any Wi-Fi networks, contact Apple.
• Update your Wi-Fi router with the latest firmware and make sure that the router supports your Apple product. For more information, contact the router's manufacturer."

We hope this helps.

Cheers!

deanfromsan Jose,

Thank you for those details. Let's review your router settings to make sure its working as expected:

"Router settings

To ensure that your devices can connect securely and reliably to your network, apply these settings consistently to each Wi-Fi router and access point, and to each band of a dual-band, tri-band, or other multiband router. Before changing the settings, you should take these steps:

• Back up your existing settings, in case you need to restore them.
• Install the latest firmware updates for your router. This is generally done from the app or webpage that you use to administer the router.
• Update the software on your other devices, such as on your Mac and on your iPhone or iPad, to ensure that they have the latest security updates and work best with each other.

After changing the settings, you might need to forget the network on each device that previously joined the network. This ensures that the device uses the router's new settings when rejoining the network."

Additional details can be found here: Recommended settings for Wi-Fi routers and access points

If the issue persists, can you provide a few more details? Doe this happen with other networks? Which iPhone and iOS version are you currently using? Also, when did you first notice this?

Cheers!

Hi there deanfromsan Jose,

How long would you say it takes to reconnect to your Wi-Fi network after waking the iPhone 8 from sleep? Also, if available, have you noticed if this happens with other Wi-Fi networks with your iPhone 8? When you wake your iPhone and go to Settings > Wi-Fi, do you see any message near your network name there? We want to make sure we fully understand how long it's taking and additional details, as it can help determine possible next steps.

If you haven't already as well, you'll also want to follow the steps in this article as VPN or certain types of software/apps can sometimes cause issues with Wi-Fi on devices: Check VPN (Virtual Private Network) and third-party software to help resolve network connectivity issues

Take care!

Greetings Deanfromsan Jose,

Since this issue only occurs with your device and with both of your networks, we suggest that you have your iPhone evaluated by a certified Apple technician. They will be able to verify if a hardware component could be the root cause of this behavior. You can follow this link of more details: iPhone Repair & Service

Best wishes!