The last few nights I've been getting the message that my Roku, model 4670x, is overheating. Usually, I ignore it because it doesn't repeat, but the last few nights I've gotten several messages. The device lives on an open shelf next to a switch and a Tivo box, there is at least 4 inches between these devices. I've tried to blow the device out with canned air but there are no vents or openings. The supposed solution is to stop using the device which in my opinion is a non-answer. The device works fine even when overheating. I've taken to laying an gel ice pack on the Roku to cool it down. Any other ideas?