Solution Steps

1. Restart iPhone: Hold Side button + Volume Down → Slide to power off.
2. Update iOS: Settings → General → Software Update.
3. Clear storage: Delete unused apps, photos, and files.
4. Close background apps: Swipe up from bottom → Swipe up on apps.
5. Reset all settings: Settings → General → Transfer or Reset → Reset All Settings.
6. Disable Background App Refresh for unused apps.
7. Check battery health: Settings → Battery → Battery Health (replace if needed).