Before what? Did you get a refurb for something other than the 3RL?
I would say that your placement is what helped the overheating and lock up manifest itself and will soon cause the 3RL.
Recently moved, and when i re-set up my desk instead of it vertical on top of the 3rd shelf in the desk, it is on the 2nd.
There is no ceiling fan in the room it is in now, so less air movement.
Desk looks like this:
But those side panels are not there on mine (and its prettier, and less messy) and the 360 currently is on the shelf above the monitor pointed somewhat to the right.
It's not locked away or sitting in a space that I would suspect its getting hot in, but I could see it being a stretch that these conditions could contribute to a freeze, especially since a fan on it appears to prevent said freezing.
Going to Coloroado and will be bore there for over a week next month, so trying to keep my 360 healthy so I can bring it
Will be moving it tonight.