Infamous Iron Man personal Armor Up

How does Infamous Iron Man lose his personal armor up buff? I was fighting a Dr. Doom boss and i was taking damage from shock debuffs but I thought Infamous Iron Man is shock immune until I looked back at the Deep Dive for him. It said he's only shock and incinerate immune with his armor buff and he can lose it during a right and then have it restored. But how does he lose it? Not sure if it's from armor break since i don't think dr doom has armor break in his basic attacks or special 1's
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Regardless of nodes its very easy to lose your armor fighting Doom with IIM