A. If the app crashes frequently, try clearing the app's cache or data. Go to Settings > MUBR and look for options to clear cache. If this option is not available, uninstall the app and reinstall it from the App Store to reset its data.
B. Ensure your iPhone's operating system is up to date. Go to Settings > General > Software Update and check if there are any updates available. Keeping your iOS updated can resolve compatibility issues.