iOS App push notifications can stop sometimes due to various reasons. Follow these troubleshooting steps:

Check Push notifications settings in the Purezone app

• Launch the Purezone app
• Tap the Gear icon (Settings) in the upper right-hand corner
• Tap Push Notifications > Ensure the Notifications Toggle is enabled

Check App Push notification settings in iPhone settings

• Tap iPhone Settings > Notifications
• Tap Purezone
• Ensure Notifications are Enabled
• Under Alerts
  • Select  Lock Screen, Notification Center and Banners by tapping the Check Box
• Under Lock Screen Appearance > Show Previews
  • Select "When Unlocked (Default)" - Notifications will only appear when the iPhone is unlocked
  • Select "Always" - Notifications will appear immediately even if the iPhone is locked 

Other reasons that you may fail to see push notifications

• Poor Internet Connectivity
  • Unlike SMS notifications which are sent through the cellular network, Push notifications are sent using Wi-Fi or Mobile Data networks
• Ensure your iPhone has a stable internet connection
  • Check your settings and enable mobile data if necessary
• Do Not Disturb Mode
  • Ensure Do Not Disturb mode is not enabled, as it can prevent notifications from reaching your device