A. 1. Check your internet connection: Ensure that you have a stable internet connection. Try switching between Wi-Fi and mobile data to see if the app works on one but not the other. 2. Restart the app: Close the app completely and reopen it. On mobile devices, you can do this by swiping it away from the recent apps list. 3. Clear app cache: Go to your device settings, find the app in the application manager, and clear the cache. This can resolve issues caused by corrupted data. 4. Reinstall the app: If the above steps do not work, uninstall the app and then reinstall it from the app store.