1. Update the app version: The app version of Tangshanxing is not compatible with the current Apple mobile phone system. You can update the App version, and the new version will fix some compatibility problems.

2. Clean up cache garbage: Too much cache garbage on Apple's mobile phone may also cause the app to flash back. You can clean up the cache garbage of your mobile phone, and you can clean it up through the "storage space" or "iPhone storage" options in the settings.

3. Check the network connection: Tangshan app needs a network connection to run normally. Incorrect or unstable network connection will lead to flashback. Ensure that the network connected by the mobile phone works stably and normally.