Mine is out on the open on top of a short bookcase. This shutting down might not happen for days, but when it happens, I find that it happens OVER AND OVER unless you give it a rest.
This is mostly evident when I play games. Sometimes I would force reset the thing and instantly jump back in-game. I wouldn't even get a minute of play before it would happen again.
Mine is warm, but never warmer than what most of my electronics would be. My phone gets hotter under pressure.
I also JUST confirmed that when the wireless drops, WIRED connection stays up! Even when the wireless freezes permanently and the light stays SOLID ON, the WIRED connection works and blinks!
EDIT: My speeds are pretty good, but I can only get 6Mbps, because I'm on the 'edge' of town. I live right next to the elementary school. I figured they'd have more powerful nodes near the schools!!
Assuming it isn't peak time I get a solid 500-600KBps.
EDIT EDIT: