My Surface Laptop 3 gets hot to some even though it is closed. But not completely shut down. Most of the time it is being charged, but once it got very hot even though it was not being loaded and closed. It was mostly closed between 4h and 10h. What's up with the laptop?
The fans are probably off too, but warm! = Hot.
With mine, there's usually still a program open that prevents the shutdown. Could there be something like that?
Otherwise, when the laptop is on the charging cable, some have the function that they stay on when they close. Have you checked that already?
Know the problem but it's just that the laptop continues to run. For me triggered by an external mouse. Just pushed a millimeter and the box runs. Especially bad when it's in your pocket. If he is still at the store, it really warms up again. Should you drive the box down properly.