I have a fairly large project in App Inventor, but during a recent test, I discovered that about 30 seconds after launch, the app crashes and restarts from the first screen. What could the problem be? Thanks.
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Try again.
Here's my first look.
You have 10 Screens, bumping up against the AI2 limit.
You also use extensions, which i don't support.
Here's the last opened Screen:
You have lots of Clocks.
Switching Screens without stopping all Clocks and Players first can cause side effects like you describe.
Does this sound familiar?
(I don't give private debugging, so I am switching to the main thread.)
In Screen8 you have errors that need correction.
Also, don't use an empty Screen Error event block.
Don't use an empty text for a TinyDB default value in an arithmetic operation.
Use 0, other wise the AI2 math will reject it.



