My work computer developed the same problem (MacBook Pro 15-inch, 2017). If the battery wasn't 100% charged and it was plugged into a charger, the mac reliably

My work computer developed the same problem (MacBook Pro 15-inch, 2017). If the battery wasn't 100% charged and it was plugged into a charger, the mac reliably fried usb-c ethernet-dongles. I took it to an Apple Authorized service provider and they called me, and said that the computer is just fine. To add insult to injury they even sent me a screenshot of a big green "passed" message.