I see that there are many threads about this… I just ran into it myself. I was connected to the Tablo at the time, browsing the guide, when the unit suddenly disconnected from my tablet and the blue LED started flashing in groups of 3 or 4 then a pause then rinse and repeat. I was recording a show at the time, so I was unsure what to do. But after a few minutes, I reset the unit and it is back online.
Overheating? The unit was warm-ish… but not what I consider hot. Nothing is around it, it sits in a well ventilated area on a flat wooden surface. I guess airflow could be improved by putting bigger feet on it.
My shows that were recording, ended up being split in 2 by the disruption, no big deal. I am use to that with the other dvrs I have used.