BSOD/crash playing games, memory error on shutdown

Ran MemTest86+ for over 8 passes, no errors. Have gotten 2 more blue screens with even more stop messages, both playing Destiny 2. Interestingly, one of the crashes happened during the same cutscene as a previous one but with a different stop message and a slightly different place in the cutscene.

This latest crash went into the broken state briefly first. It actually blue screened when I tried to access my third hard drive. I heard it spin up (WD Blacks are loud), saw the files inside, then BSOD. Could have just been delayed from the crash though since it was only about 30 seconds between. I'm first going to try to turn off Windows power saving putting that drive to sleep, and if I continue to have crashes I'll unplug that drive. EDIT: turns out Hard Disk is already set to never turn off...I could have sworn I heard/felt it spin up

I unplugged my third hard drive that wasn't in use and re installed Nvidia drivers. It did still crash (no BSOD), but it was after 3 hours rather than 1. I did notice some frame drops occasionally after an hour or so of playing Destiny 2, more than I'd expect and have gotten in the past.

I'm not sure what else to check atm...I might try and install one of my crash-prone games onto the third hard drive. It's possible that heat is an issue for my second drive; during HD Tune tests, both HDDs were hovering around 55C and I know that my case temperature does rise after hours of gameplay. It would make since that unplugging my third drive would delay the issue since they are in a drive bay next to each other, but doesn't make sense that it would be fine for even longer play sessions after a reboot...

I was monitoring temperatures and they were within reason; CPU maxing at 55C and GPU maxing at 73C. GPU was hovering around 65 near the beginning, and rose slowly over the course of the play session.

I've had a few more BSODs, however when I went to create the usual dm log, I noticed it say there were no minidumps. My computer did recently update to Fall Creators, and I don't have the 'Disable automatic deletion of memory dumps when disk space is low' ticked, but the drive isn't even half full.

Anyways, I'm going to try some more troubleshooting steps and wanted to run them by the thread before actually doing them:
- Re-seat graphics card and memory. Already done today, will be doing a test (aka, normal nightly gaming) to see if it crashes.
- Move a crash-prone game to third hard drive and unplug current
- Swap out my 1080 for my old 750TI I still have lying around
- Buy a single 16GB DDR4 RAM stick and use that in a different slot. Unfortunately my cooler covers one of the memory slots, so I can have a max of 3 sticks. If nothing else, I'm upgrading to 32GB of RAM =P Probably last test b/c it involves spending money
- Reinstall Windows

Anyone have a suggested order I should attempt these in? I'm thinking next step is probably either install on third drive and unplug second, or swap graphics cards

@Ztruker Memory is now in that configuration. Before they were both in the DIMMB slots.

Had another blue screen after ~20 mins on Divinity: Original Sin 2, then played for another hour and half no problem...I think reinstalling things on third hard drive and removing second is my next move.

I also haven't said this so far this thread, but thank you all for helping me through this troubleshooting. It's so strange how it seems to be pointing to everything, but every test run comes back with no problems...