Please follow the below steps:
1. Re-login after exiting the application.
2. Switch the network.
3. Confirm whether the app's software is the latest version. If not, please update the software and see whether this affects the issue.
4. Restart the phone.
5. Uninstall and reinstall the app.
6. Backup data and restore factory settings.
If the issue persists, contact the Nothing Support Team for further assistance.