Xiaomi, Redmi, POCO, Tecno, Infinix, itel, Oppo, Realme, Vivo, OnePlus, Huawei, Honor and Samsung phones can stop apps in the background to save battery. To keep reminders arriving:
- Allow Autostart for Assignment Tracker. It is usually under Settings, Apps, Assignment Tracker, or in the Security or Phone Manager app.
- Set Battery to Unrestricted or No restrictions for this app.
- Do not use Force stop or a cleaner app on it. That cancels its reminders until you open it again.
- Keep Do Not Disturb off, or add Assignment Tracker as an exception.