Game crashes often occur when your device is low on RAM (this is different from storage space). To help alleviate these crashes, please try the following workarounds, in this order. If the issue persists after completing a step, try the next one.

• Restart your device: Press and hold the Sleep/Wake button until the red slider appears. Drag the slider to turn your device completely off. After the device turns off, press and hold the Sleep/Wake button again until you see the Apple logo.
• Force close all open apps: Quickly press the home button twice. Swipe your finger up on each of the app previews you see to close them.
• Ensure a stable internet connection: Use a strong Wi-Fi connection instead of cellular data if possible.
• Check for app updates: Make sure you're running the latest version of the app by visiting the App Store.
• Free up storage space: Delete unused apps, pictures, and videos from your device.