If they are resetting at low power, it is likely not the same issue that requires using the 1.1V firmware. I would guess that it might be similar to what I am seeing on this one, but I am waiting for some confirmation on tests from Lucko that his other boards have the same cause. If that's the case (and he gives me permission to mutilate this PCB) I will try verifying what the problem is more in depth and it's possible a fix can be done going forward for people haven't gotten their boards made yet.

For those that already have their boards, it will depend on what the root cause of the problem is. If all the boards exhibiting the low power shutdown have the same issues as the one I have, it's entirely possible that it cannot be fixed and still function to its potential. If the problems with the power supply are consistent (IE, it's always the same phase causing problems) it's possible that you could send the boards back to Lucko and he could modify them to run with one phase less and a max current of 120A instead of 160A.