You are probably correct about it overheating. Get a fan or move it like you stated.
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I would call B&K and tell them what's going on. I had a ref 30 but only for a short time. I recall it putting off heat, but not getting hot. If you have at least 2" above the unit that's unobstructed it shouldn't get hot. You also may want to go through the reboot sequence (I don't recall the key sequence but it's in the manual)