I'm sorry, but the poster did not ask about safety issues. Her concern is that the overheat causes her computer to freeze when it's being used heavily.
This is a critical issue for me. I have had this happen multiple times lately when I have been teaching College courses via videoconference. Very uncool when your professor's brand-new high-powered laptop freezes up due to overheating!
I have stopped using the Dock 2 altogether. And, guess what, my problem went away.
This is clearly a design fault, regardless of Microsoft repeatedly claiming that "yeah it's hot, don't worry about it, it's normal". It's not normal to repeatedly go into thermal shutdown in the middle of very public situations.
(Anyone want a slightly used Dock 2? I have one to give you. Free. But, I don't recommend you try to use it.)