where is my FOTUS gone?

I was just playing a game with fotus on then once the game ended it seems to be gone, its not in my armoury either :-S

I have a similar issue, but it comes and goes. The weird thing about it is that every time I level up it shows that I unlocked it, along with the Light Rifle IMP. It happened again last night. It would be nice to know why.

You lost your -Yoink!- huh?