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There could be several reasons why a SwiftUI app crashes intermittently when a TextField is tapped. Some possible causes may include:

1. Improper handling of the keyboard: If the keyboard is not properly handled in the app, it can sometimes cause a crash when a TextField is tapped.

2. Memory leaks: The app could be running out of memory due to memory leaks, causing crashes when a TextField is tapped.

3. Incorrect data type: If the data type of the TextField is incorrect, such as passing a string when an integer is expected, this could cause intermittent crashes.

4. Network connectivity: If the app requires network access for some functionality, intermittent crashes could be caused by poor network connectivity.

5. Bugs in the platform or framework: Sometimes, bugs in the platform or SwiftUI framework can cause intermittent crashes.

To diagnose the issue, it is recommended to use Xcode's debugging tools, analyze crash logs, and run tests. It is also important to make sure the app is properly handling edge cases, such as empty or null values, to prevent crashes from occurring.