Follow these steps for the app troubleshoot： 1. Go to Google Play or the iOS App Store and make sure you are using the latest version of the app.  2. If you are already using the latest version, close the app, make sure it's not running in the background, and then open it again. - Android: Select Settings -> App Management -> App List -> No Apps -> Clear Cache, then reopen the app. - iOS: Select Settings -> General -> iPhone Storage -> No Apps -> Clear Cache, then reopen the app.  3. If the problem persists, please uninstall the app and reinstall it. Note: Please make sure your device's OS version supports the HHOGene App.