iOS App Packages, but freezes / need to restart phone

Up until now, I was able to package the app without a problem and it would run on the phone (iPhone XS Max) without any problem.

Now however, whenever I package a new build (developer version) the app starts, but freezes on the splash screen.
I need to restart the phone completely to be able to launch the app, but this is not a feasible workaround. This was never happened before and a new build was immediately running on the device.

Any idea why this is happening and any suggestions?

Thank you for your help and suggestion.