Clear the cache of apps
It can happen that one or more of your apps or their related functions are not working as they should. Each app has a cache that hosts temporary data files for quick access. Sometimes conflicting files end up in your cache and can cause issues in your phone. To solve this, you can clear the cache of all these data. This does not erase user data (e.g. settings, pictures).
So if a specific app misbehaves:
- Go to Settings → Apps & notifications
- Find the app and tap its icon
- Tap on Storage
- Push the button Clear cache.
If the issue persists, you can proceed with more rigorous steps as uninstalling and reinstalling apps, reset app preferences, using Safe mode, testing your SIM card or - as a last resort - returning the phone to factory settings.