A. 1. Check for any available updates for the app in the App Store and install them. 2. Ensure that your iPhone has enough storage space available. Go to Settings > General > iPhone Storage to check and free up space if necessary.
B. 1. If the app continues to require reinstallation, consider resetting your iPhone's settings by going to Settings > General > Reset > Reset All Settings. This will not delete your data but will reset system settings.