Please try the below:
1. Check other apps or webpages to confirm if the connection is stable. Confirm that mobile data is turned on and check if your mobile data package has exceeded its limit. Alternatively, connect to WiFi.
2. Exit the game, remove the background cache and then re-enter the game. Find the game app in Settings > Apps > See all apps. Go to Storage & cache in the game settings to clear the cache.
3. Uninstall and re-install the gaming app.
If the issue persists, contact our Customer Support for further assistance.