Yep just had the same issue with my new XT2 I stash my camera bag next to a radiator but the body didn't get hot in any way. To address the point above, I have previously charged the internal battery using a USB cable and don't remember this issue........ stood outside last night for about an hour getting photos of the moon so it had a good chance to cool down but the problem persisted. Will check again tonight but have registered issue with Fuji and I think they're sending me a box to RTB...... 48 hour turnaround though and I assume it'll only go to Fuji in Bedford which is 5 minutes from me :-)
Oddly enough its only that I did the firmware update about a week ago and then reset the camera to default which brought the live view onto the rear screen where I then noticed this. I always default to the viewfinder and don't check my shots that often on the screen so may not have noticed this if I hadn't!!!!
Anyone else seeing this or had theirs returned?