It appears that some older devices released during or prior to 2016 (mainly iPhone 6's) are still struggling with the amount of Memory that the game requires. This means they might experience some issues with loading ads. To combat this, please try and limit your playing time to shorter bursts, make sure all background apps are closed and ensure you are playing with a strong wifi connection. You can also try updating your iOS version if possible. We are still working on optimising this for you! Thank you for your patience.
If you are playing on a newer device, please ensure you have the latest app version. If this continues to crash, please contact us letting us know which device you are using (make and model) and whether this is a specific advertisement which causes your game to crash or if it occurs with any ad.