Strange app reaction

Since two weeks i get sometimes a situation, where i dont know to avoid and what happen: My running app in release mode looses all my shown data, all spinners, labels, listviews are empty, but the app is still showing.
I have no code, which could make this situation, i made many log to find the situation, which is behind this situation. Has anybody seen an simular situation or has any hints to find or avoid this?
The app is complex, with starter service, mqtt, ten activities and more then...

Strange app reaction

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