We are having the same problem with our UI Tests. It happens about half the time lately and for the last few weeks. Common errors in the logs:
Simulator device failed to launch...
Failed to prepare device 'Clone 1 of iPhone 16' for impending launch. (Underlying Error: Unable to boot the Simulator. launchd failed to respond. (Underlying Error: Failed to start launchd_sim: could not bind to session, launchd_sim may have crashed or quit responding))
Test runner never began executing tests after launching
Early unexpected exit, operation never finished bootstrapping - no restart will be attempted. (Underlying Error: Test crashed with signal kill before starting test execution.)
nickcurran-bsc
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I'm also having this issue, and it's very annoying.