A. 1. Close the app completely and restart it. 2. Ensure that your device is connected to a stable internet connection, as the app may require it to load properly. 3. Clear the app cache by going to Settings > Apps > JBL PartyBox > Storage > Clear Cache.
B. 1. If the problem persists, try uninstalling and reinstalling the app. 2. Check if there are any firmware updates available for the PartyBox and apply them.