What are the most common root causes of Zwifts app crashing on startup, and are there any known correlations between these crashes and specific hardware or software configurations? For instance, do users with certain graphics cards or processor architectures experience more frequent crashes than others? Are there any notable differences in crash rates between Windows and macOS users, or between different versions of the Zwift app? Additionally, are there any steps that Zwifts developers are taking to address these crashes and improve the overall stability of the app?