gab's da nicht gerade ein Systemupdate das das beheben soll?

macOS Mojave 10.14.6 Supplemental Update –– Restart Required

This update contains bug fixes that improve the stability, performance and security of your Mac, and is recommended for all users.

This update:
• Resolves an issue that may cause certain Mac notebooks to shut down during sleep
• Fixes an issue that may degrade performance when working with very large files
• Addresses an issue that may prevent Pages, Keynote, Numbers, iMovie and GarageBand from updating