Has anyone else had serious overheating problems with their R15-100? I just started service yesterday and have had to shut down the thing at least six times. The DVR gets pretty hot, the last time about 60 degrees Celsius. I know the fan should turn on at a certain point but I don't feel much in the way of airflow back there. Right now, the box is located on top of my TV with plenty of room around it. DIRECTV said they will send me a replacement box for Wednesday. I just want to know if this is a recurrent problem with these boxes or I just got a bad one. Thanks!