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The underneath of the DCT is covered by a panel which has drain holes...if you were losing enough fluid to cause an overheat its likely you would see signs on your garage floor.
Could be a faulty temp sensor in the DCT.
There is also a preheat system that directs the DCT fluid through an (engine coolant) heat exchanger to reduce the time it takes to reach normal operating temp - a fault here (some sort of sticking thermostat perhaps) might cause an overheat.
You know of course only the dealer can figure it out but it should be some reassurance that the DCT has proven to be incredibly reliable.
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