Loss of Amp in mission (Lich missions?)

[MetalGrayFox]

Hi,

I sometimes lose my amp when playing Lich nodes and I am not sure what is the cause of this. This reverts my primary fire in operator mode to the Void Blast.

Is this a cause of liches having radial disarm / some other ability which takes away the amp for the rest of the mission? I cannot say if this occurs in non-lich nodes also as I have not been playing much of those atm to notice. Hope someone can investigate at some point.