A. 1. Update the Rook app and your iOS to the latest versions to ensure all known bugs are fixed. 2. Check for any available storage on your device. Go to Settings > General > iPhone Storage and ensure you have enough free space. Low storage can cause apps to crash. 3. Perform a soft reset of your iPhone by holding down the power button and the volume down button until you see the Apple logo. 4. If the app continues to crash, try uninstalling and reinstalling it to ensure a fresh installation without corrupted files.