I have same issues, when i run via xcode, it is starting to copying shared cache symbols. Looks like when you upgrade to a new iOS, it needs to copy those files first. When having this via wireless, it might take too much time and idle out.

My solution:

1. Did you update iOS recently?

2. Have you downloaded the latest xcode files? (Open xcode after update macOS)

   1. Yes, than start your app first via xcode to get the new symbols copied over