If this problem only occurs when your phone is connected to your Wi-Fi network, it's possible that your Wi-Fi connection is to blame. Try deleting the Wi-Fi network from your phone and reconnecting to it.

1. Get to the Home screen.
2. Select Settings.
3. Select Wi-Fi.
4. Right next to the Wi-Fi network you wish to delete or forget, tap the blue I or information symbol.
5. Tap the Forget this Network option.

• Check that the phone's time and date are set correctly.
• Connect your phone to a different Wi-Fi network to see if it helps. If the problem does not occur, the issue could be with your router settings.
• Turn off your router and your phone to see if it helps. Turn off both devices.
• check if it works or not