Unresolved Print failure at exact layer.. What is going on? Completely lost...

Hey guys.
Have no idea what's going on, and have no where else to go...
Been 3D printing for years now, and have never come across an issue like this.

Printing PLA (Multiple brands) @ 210C-215C (and everywhere in between).... Current print is 100% infill, although most is support material.
Currently printing via SD card.
Simplify3D.


After "X" layers, suddenly the print fails.. Gaps form in the print, layer adhesion fails, it's as if there's not enough filament going through the extruder. I'm beyond confused.
I'm usually able to research the problem online, and have it resolved - but this time it is different.
I've gone through over 3KG of filament, and every time at a random layer the print fails.
The pictures I've uploaded are the case for the last many attempts.
Can anyone please give me some insight..?





If anyone has ANY information on what may be going on, please let me know.
I'm completely at a loss.
Every time, it fails at a very specific layer height.
I have never seen this before, and I cannot find any further information online.
It's almost as if it's a software bug.

Edit: I just attempted another print, and aborted..
The loose/faulty layers (about 20 layers) were bound between normal layers like a sandwich.
This is absolutely bizarre...
Please help me...