Very strange. I only get 3 grams at a time. And if I get more the other ones despawn. Anyone else having this issue?
I think this is happening to me too.
They might have patched this so it limits the amount of engrams per place
Found a new spot even better atm and its non stop 
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share it with us bro! we would love to hear it!
this right here good sir best spot in my eyes its non stop every two seconds enemys spawn and all the orbs just collect in the cave.
It’s pretty good but a little slow.
Updated the thread with this video too, thanks a lot.
If it’s slow for you, it’s because you’re standing too close to the cave. Stand farther back, and the enemies will spawn faster.
I’ve been using that method for a couple days and got almost a hundred rare engrams. Also, there’s almost always people already there farming. You can just go afk and let them kill the enemies for you. Come back, run in the cave and grab your loot. My friend got a legendary engram after five minutes of farming too.
What have you’ve gotten by doing this the past two hours?
For some reason if I play on level 6 I get abit of loot but then if I play on level 9 I get nothing at all.
Have to keep replaying the mission over and over again. Of course sometimes you wont get anything thats why its called farming. Also its better if you do it on a hard mode