I apologize for the inconvenience you're experiencing with the app. I've tried to respond to your email, but unfortunately, I received an error message and the email was returned. Based on your description, it seems you've taken the right steps by signing out, deleting the app, reinstalling, and signing back in. It's concerning that the app syncs for a few seconds and then crashes. I'd like to mention that I was able to access your data and switch between many of your pools without any issues on my end. Can you let me know what happens when you open the app immediately after it crashes? This information will help us further diagnose the problem. Additionally, given the email issue and the app behavior, there's a possibility that your device might be affected by a virus or malware. It might be worth conducting a thorough security scan to rule out this potential cause.