Holy hell, there are THREE ribbon cables and a wireless cable that goes through that hinge. This is beyond my ability to fix, although I did narrow it down to what I believe is the screen ribbon cable, or whatever the bottom cable is. It has a nice bend in it from the factory. I think that cable is failing.
Here's pictures. Hopefully someone can confirm this so I can take it over to the uBreakiFix and let them do it.
Suspected cable:
https://imgur.com/rMqlTPM
Better pic:
https://imgur.com/cdUJ558
Then I see that it looks like the middle ribbon cable might be pulling out, but I just cannot get it to slide back in. Heres a picture, but its not the best:
https://imgur.com/vLUxfYA
Thanks for looking.
Edit: So, it must've been a loose connection. I've managed to get the middle cable seated. Turns out in the years I've owned it that the little flap that secures the ribbon cable connection had worked loose and wasn't securing the inside part of the ribbon cable. Luckily I have a tiny long spudger that allowed me to pop it down fully, grab the cable with a pair of long thin needle nose pliers and seat it and then push the flap closed. It no longer POPS and shuts off!
Also, for those pesky security screws that hold the SD card slot in (I'm not certain what they're called)... I've found that if you take a straight slot #1.5 and take it to a Dremel to cut a third of it off, it will get into one of the wings and bite really well. Picture of modification included. I'm positive that a #1 would work as well, but be aware that the head might actually be too thin to be effective in one of the wings.
Pictures:
https://imgur.com/kD0hrZk
https://imgur.com/TVriB5F