The problem arises from the CMOS sensor overheating in certain temperature ranges. Sony has put together a chart that provides an idea of max recording times under certain environmental conditions. You can check it out below.
Obviously, image stabilization is a big problem for shooting long clips.
Frankly, I don’t see this as a major issue that’s any different from other cameras. I’ve had 5D Mark II and 7D cameras shutdown from overheating on me before, so it’s nothing unique to Sony.