Temp Fix on Overheating
Not sure about the 7, but, on the 5N.. the back of teh camera (after the pull the CLD up) is just a sticker. If you pull the sticker off, the frame below it has a bunch of holes and such. So, during video recording, just flip the LCD up and if there is any airflow at all, it should be enough to cool the camera. Its worked for me pretty good.
I've heard the same, though I would mildly worry about crap getting through those holes.