What i have herd is the Havoc is shutting down due to heat and not resetting, so to answer your question it shuts down and then it's off to Novak for repair.
I run 3 havoc esc's and have not had that problem, so I guess I will call myself lucky.
If you are looking for a decent set up on a budget, Havoc is not a bad deal as the Tekins and LRP's are more money, but good systems. I have not had the best of luck with Tekin, bought a RS and had to send it in 3 times for the same problem, so i went back to my trusty Novak ESC's.
Now with that said, please understand, I will not talk bad about Tekin, I have used their stuff in the past and it is excellent quality, but it's just not for me.
Go Fast, Turn Left, Repeat as needed!!
It's not as easy as it looks!