I had a dell laptop around 2012 that had this same problem, on Windows 7. I also remember holding it up to my ear to confirm it shut down haha. And it did wake

I had a dell laptop around 2012 that had this same problem, on Windows 7. I also remember holding it up to my ear to confirm it shut down haha. And it did wake itself up and overheat in my bag a couple times. I've just avoided Dell ever since when I can. My current work laptop is some sort of Dell XPS, but at least I didn't pay for it.