-Close all apps and restart your device, making sure to leave it switched off or at least 10 seconds
-Please check for any updates for your device and apps
-Make sure that you have sufficient memory free on your device.
-As a last resort, we can try reinstalling the game as it usually fixes most issues.
Please note that any booster or extra lives stored in the game may also be lost during this process, so it's worth trying to use them up before reinstalling