- From the Home screen, select Settings.
- Select General.
- Scroll down to Reset and tap it.
- Choose Reset network settings from the list of alternatives.
- To proceed, enter your device's passcode if prompted.
- Tap to confirm that the network settings have been reset.
Allow your device to finish resetting network settings before rebooting. It is important to note that your Wi-Fi networks are erased during the process. Having stated that, you will need to configure and connect to your Wi-Fi network. to use Wi-Fi internet on your iPhone again. Then check if App Store that keeps restarting the issue has been rectified.