Behavior

If any feature stopped working after killing the app, for example

• SMS notification doesn't show anymore
• Scheduled task doesn't run, such as auto clearing history records, or automation tasks.

Reason

On some devices, "app auto start" is disabled by default for better battery life.

Solution

Enable "app auto start" for this app in battery settings:

-> System Settings
-> Battery
-> Auto-start Manager, or Background Control, etc...
-> enable SpamBlocker, for some devices set it to Optimized or Unrestricted