Rubble Heap Failure

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Running into issues with Atlas' Rubble Heap augment. 

At seemingly random intervals.when above 1400 Rubble, Landslide will start to cost energy again. I've been unable to determine a specific trigger for this. It is not enemy faction specific (has happened with all factions) and has happened with multiple focus schools (tested Zenurik, Madurai, Naramon.)

The problem can usually (though not always) be rectified by dropping below 1400 rubble, then going back above 1400 rubble again. In the event this restores Landslide to being free to cast, it will still eventually fail again anyway.

Side issue: Atlas staggers when summoning Archguns and when firing fully charged shots from Velocitus and Corvas weapons. Less detrimental, but still problematic.