I've noticed for the last few weeks that when I use it in Tablet mode, the thing gets really warm in the back. I don't have anything running except OneNote and maybe email. I usually bring this for meetings so there's no games, YouTube, or anything heavy in the background. But it's definitely warmer than usual. I'm bringing in the unit tonight to the Microsoft Store because of this issue, and plus I can't get my Pen to write. I can click on it to start OneNote but it won't respond. I wrote on it fine on Monday, but today, nothing. I have a different thread on it.