Please try the following steps in order to resolve this issue:
- Close the Game Application and ensure it isn't running in the background
- Repeat step 1 with all other apps that are currently open
- Make sure you have plenty of storage space on your device
- Cycle the power on your device (turn it off and on again)
- Launch the Game Application without any other apps running
Reinstalling the game is also a great way to resolve any underlying issues but should only be done as a last resort.
These steps can resolve many random freezing or crashing issues people may come across.