UE app not working anymore

I have created a simple UE5 app for the meta quest pro.

It was a nightmare to make it work and get the right configuration.

But somehow it worked.

After 3 months ... it does not work anymore.

It just crashes after the start without any information.

No update was made to the app. No update was made for the Meta Quest Pro. The environment is the same.

What could be the reason why it has stopped working?

Are there any background updates?

Why are there no error messages?

Thank you