Re: xps 13 9380 wake from sleep while lid is closed
It's not just Dell. This unexpected wake from sleep can occur with other manufacturers' laptops too -- including Apple. You'll find similar complaints on their forums. I've got my 9370 set to sleep with the close of the lid and it goes into hibernate mode after one hour. That way, it doesn't drain the battery. If I'm going to pack it away in a sleeve or bag, I always shut it down fully as a precaution. With an SSD, boot times aren't too bad, so I don't mind waiting a bit when I need to use the laptop again.
I doubt that your laptop has any permanent damage. But heat is definitely not great for the battery and is something to avoid.