It can be a major disruption to your daily life when LINE messages arrive without a sound or the notifications themselves are significantly delayed. The root cause is often a complex mix of in-app setting errors and system-level factors such as “Battery Optimization” or “Focus Modes” on your iOS or Android device.
In this article, we pinpoint why LINE notifications stop working and provide a step-by-step manual for emergency fixes. Let’s restore your notification settings to ensure you never miss an important message again.
Main Causes of LINE Notification Issues
Notification failures generally fall into these three categories:
1. Device and OS Settings (Most Commonly Overlooked)
- Notifications Disabled: System-level notifications for the LINE app are turned off in your phone’s main settings.
- Do Not Disturb / Focus Mode: Features like “Do Not Disturb” (iOS) or “Silent/Focus Mode” (Android) are suppressing alerts.
- Power Saving / Battery Optimization: Aggressive battery-saving settings may be preventing LINE from checking for new messages in the background.
- Background App Refresh Restricted: The device has restricted LINE’s ability to run in the background, cutting off real-time alerts.
2. In-App LINE Settings
- Internal Notification Off: The “Notifications” toggle within LINE’s own settings menu is disabled.
- Individual Chat Mute: A specific person or group chat has been manually muted (the speaker icon with a slash).
- Multi-Device Conflict: Being logged into the PC or iPad version of LINE may cause notifications to be redirected or silenced on your primary smartphone.
3. System and App Glitches
- Outdated App Version: Incompatibility with the latest OS can cause notification bugs.
- Unstable Connection: Weak Wi-Fi or mobile data causes a lag in receiving the signal from LINE’s servers.
- LINE Server Issues: Temporary outages in LINE’s global notification delivery system.
Emergency Response: Steps to Restore Notifications
Follow these steps in order, focusing on both the device and the app settings.
Step 1: Check Device and OS Settings (Highest Priority)
- Disable Do Not Disturb / Focus Mode: Ensure your phone is not in a mode that silences incoming alerts.
- Check System Permissions: Go to your phone’s Settings → Notifications → LINE and ensure “Allow Notifications” is toggled ON.
- Disable Battery Optimization (Android): Go to Settings → Apps → LINE → Battery and select “Unrestricted” or “Not Optimized” to ensure the app can run in the background.
Step 2: Check Internal LINE Settings
- Verify Global Notifications: Go to LINE Home → Settings (gear icon) → Notifications and ensure the top toggle is ON.
- Unmute Individual Chats: Open the specific chat that isn’t notifying you, tap the menu (three lines), and ensure it says “Mute” (meaning notifications are currently ON).
- Restart and Update: Force-close the LINE app and restart your phone. Check the App Store or Google Play Store for updates.
Step 3: Check External Factors
- Log Out of Other Devices: Log out of the PC or iPad version of LINE to see if notifications return to your smartphone.
- Reinstall (Last Resort): If all else fails, ensure your chat history is backed up, then delete and reinstall the app.
💡 Preventive Measures: Habits for Reliable Alerts
- Keep Your OS Updated: System updates often include critical bug fixes for notification delivery; always keep iOS or Android current.
- Periodic Setting Audits: After an OS update, check that your “Focus Mode” or “Battery Saving” settings haven’t reverted to defaults that block LINE.
- Clear Cache Regularly: Periodically clear the LINE app cache through your phone’s storage settings to prevent data-related lag.
By following these steps, you can resolve notification issues quickly and minimize the risk of missing vital communication.
