I have a brand new Roamio OTA 1TB VOX DVR. When the unit's internal temperature (MBT) get's 43*C or more, it sometimes blanks out the picture on most channels. A couple channels still work but by far, most don't. There is no loss of signal or any other indication anything is wrong or is overheated. The case on the right side (board side) of the unit gets extremely hot (more so than it's normal hotness). My only recourse is to unplug the unit from the wall and wait 15 minutes for it to cool down. The unit is in an open air environment and I have verified the internal fan is operating.