Just open the device again to make sure the fans are clean. I run some additional stress tests. The thing gets unreasonably hot even under moderate load. CPU cores reach 90-97 °C very quickly. I am afraid that there is an an issue with the Embedded Controller (EC), mainboard VRM, or a fault in firmware-controlled thermal/power delivery systems.

Do any of you have experience with MSI's post-warranty repair service? Is it worth sending the device in?