If you're having issues with notifications, you may be able to resolve them by canceling your device's battery settings. To do so, follow the steps below.
Note: These steps and labels may differ depending on your Android OS version and device.
To turn off your battery saver schedule:
1. Go to your device's Settings, then search for and tap Battery saver.
2. Tap Set a schedule.
3. Select No schedule.
To allow battery usage in the background/turn off battery optimization:
1. Go to your device's Settings, then search for and tap LINE under Apps.
2. Tap Battery.
3. Tap Unrestricted.
Let us know if we can make it better.