Please try the below:
1. Switch the network to see if the issue is affected by the network.
2. Log out of the app and log in again.
3. Confirm whether the app version is the latest. If it's not the latest version, please update the software accordingly.
4. Restart the phone.
5. Use the app on other phones in the same network environment to see if there issue persists. If so, we advise you to contact the app creator.
6. Uninstall and reinstall the application.
7. Back up your data and restore the phone to factory settings.
If the issue persists, contact our Customer Support for further assistance.