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I do and usually closer to 60F. I'm from Canada though. :p
I did end up RMA'ing my unit. Sadly the replacement still gets very hot. With an idling desktop (wired) and laptop (wireless) connected and one of my cell phones (wireless). Temperatures are still hitting an excess of 50C on the bottom close to the front of the unit.
I notice that if I elevate the router (I put it on a wire rack with no cooling fan) I get 5 degree cooler temps.
What kind of heavy use are you doing?