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The problem happens because the manufacturer of the device implemented an aggressive battery management policy that blocks third-party apps by default.
Apart from that, remember that other applications like anti-virus apps, cleaner tools and battery savers can block third-party apps too.
To solve the problem, check the following resources:
Additionally, you can use the following app to test your device for blockages:
If those resources are not enough, we recommend searching or asking in user forums from your brand for instructions about your specific device model.
See the instructions on ‘Notifications are not working’.
TimeTune uses clock alarms to schedule notifications. This makes the alarm icon appear on the status bar, but it is the only way to guarantee true accuracy on Android 5.0 and above.
However, you can hide it here: Settings / Advanced / Scheduling method.
See the instructions on ‘Notifications are not working’.
Verify that your Google account has been enabled for synchronization:
This happens because Google Drive lost synchronization with the cloud.
Possible solutions: