Xcode auto updated today on sept 17 to version 16. All apps crash with XCBBuildService quit unexpectedly unexpected service error: The Xcode build system has crashed. Build again to continue. I see various posts about this about beta. But having your prod release crash 100% of the time after you auto push to everyone seems "short sighted" to say the least. Fix: https://xcodereleases.com/?scope=release hit "download" for 15.4 and turn off system settings>general>software update> and turn off auto updates for App Store and don't forget to do this after you get a new machine, like I did.