A. 1. Disable battery optimization: Go to Settings > Apps > Rust+ > Battery > Battery Optimization and select 'Don't optimize' to prevent the app from being closed when the screen is off. 2. Check for app updates: Ensure that Rust+ is updated to the latest version in the Google Play Store.

B. 3. Reinstall the app: Uninstall Rust+ and then reinstall it to ensure all files are intact and up to date.