I do have the "same" problem with my PI. It's from RS (delivered in november) and reads also E4612RS2V13B1.0. Well, there is a slight difference to the other faulty PIs:
My PI remains stable at room temperature without case für several days and even with the case I sometimes get about 5min of use until it freezes (sometimes only 30sec though). Opening half of the case extends the time to maybe 1 hour at best. So I guess, my PI is only "half faulty". I also think that the situation became worse after time. I came to the following conclusion:
1. The power supply is not critical. I got the 1,2A one from RS and I have a DC switch regulator rated 1 A. RS supply reads 5,02V before and ~4,9V after F3. Powered with the switch regulator i only get 4,85 / 4,6 V. Without the case, the PI runs "fine" (>24h) with the switch regulator. WITH case, it freezes after a few minutes even with the RS supply. My clear advice: DO NOT spend money on a better supply or a better cable if your voltages are as high as mine. This will not solve the problem. Therefore bridging F3 is also not helpful. I even managed to run the PI with ~4,3V from a laboratory power supply without freezing for hours until I shut it down (without case).
2. As others stated: It does not matter if you have USB devices plugged in or not. I also does not matter which SD card you use unless it generally does not boot (I tried 5 cards..).
So the only solution is to cool that thing down. Since others reported that reflowing the board solved all the problems, there has to be a faulty soldering point which causes high contact resistance and heats up, resulting in the freeze. It would be nice to know WHERE this problem occurs. Since i do not want to get angry about the bad communication with RS, I will look for a reflow-opportunity..