Direct answer
Delayed alerts usually come from per-app notification settings, battery optimization, restricted background data, Focus/Do Not Disturb or a vendor sleep list.
What this covers
- The observed symptom matches this record
- Customer-accessible settings, connections and external components
- Diagnosis before reset, deletion or component replacement
What it does not cover
- ×A model-specific error code with a different documented meaning
- ×Internal electrical, battery-cell, gas, refrigeration or sealed-component repair
- ×A guarantee that every model exposes the same control label
Capture the exact symptom
ReversibleNote which apps are late and inspect their notification history, battery use and background-data state.
Run the smallest isolation test
ReversibleAllow background activity for one affected app and temporarily remove it from deep sleep/optimization for a controlled test.
Correct only the proven cause
ReversibleKeep only the narrow exception needed and restore broader battery limits for unrelated apps.
Verify before changing anything else
ReversibleSend locked-screen tests over Wi-Fi and cellular and confirm arrival time.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I check before resetting anything?+
Note which apps are late and inspect their notification history, battery use and background-data state.
What is the safest isolation test?+
Allow background activity for one affected app and temporarily remove it from deep sleep/optimization for a controlled test.
When should I stop troubleshooting?+
Do not disable all battery protection; contact the app provider if its server never sends the alert.
Answer for the exact device and software version shown above.