If you are experiencing connection issues, there are a few things your can try.
Please make sure to follow the steps in order.
1. Force close the App
2. Clear the cache and data
3. Reboot your device
If the issue persists, please try:

1. Uninstall the game
2. Sign out and back in from your Google Play account
3. Clear the cache and data
4. Reboot your device
5. Reinstall the game

If you are still having issues after trying all of the above, please write to our Support with as many details as possible and  we'll do all we can to help you out.