Apple has posted a new support document outlining troubleshooting steps for users experiencing problems with unexpected shutdowns on the 2019 13-inch MacBook Pro that debuted in July.
If your MacBook Pro (13-inch, 2019, Two Thunderbolt 3 ports) randomly turns off when it still has a charge, Apple says these steps might help:
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If your MacBook Pro’s battery is less than 90% charged, continue to step 2. If your battery is more than 90% charged, use your computer until the percentage drops below 90%, then continue to step 2.
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Connect your Mac to its power adapter.
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Quit all open applications.
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Close your computer’s lid, which puts your Mac in to sleep mode.
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Let your Mac charge for at least eight hours.
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After eight hours, update to the latest version of macOS.
If the issue persists after updating to the latest version of macOS, contact Apple.