Apple today posted a new support article describing troubleshooting steps for users experiencing unexpected shutdown issues on entry-level 2019 13-inch MacBook Pros with two Thunderbolt 3 ports, which were reintroduced in July. Apple’s troubleshooting steps require that your MacBook Pro’s battery level drop below 90% so that it’s connected to the charger, shuts down all open applications, and lets you sleep and charge for at least eight hours. If your MacBook Pro charges for more than eight hours, users must make sure they’re running the latest version of macOS, and after performing these steps, they should call Apple for service if the shutdown problem persists. There is this
It’s a fairly long thread in a forum where some troubled users gathered to diagnose and troubleshoot their computers, and the issues are scattered in other discussion forums, including Apple’s support forums.