DirectX 11 Errors

[kejoca]

Just crashed again doing old content in the middle of battle. I had my graphics cards vitals showing so I could see memory usage, heat, etc. and nothing was out of the ordinary. No error popups, but in windows event viewer it was the same ntdll.dll errors that have been plaguing me since the 5.1 patch:

Faulting application name: ffxiv_dx11.exe, version: 1.0.0.0, time stamp: 0x5db09236
Faulting module name: ntdll.dll, version: 10.0.18362.418, time stamp: 0x99ca0526
Exception code: 0xc0000374
Fault offset: 0x00000000000f9269
Faulting process id: 0x3220
Faulting application start time: 0x01d592afb63da613
Faulting application path: D:\SquareEnix\FINAL FANTASY XIV - A Realm Reborn\game\ffxiv_dx11.exe
Faulting module path: C:\WINDOWS\SYSTEM32\ntdll.dll
Report Id: b2793758-3baa-46ea-9e68-e20fb1bb86c1
Faulting package full name:
Faulting package-relative application ID:

EDIT 1: More investigating. Since over a week ago, a LOT of users are having this exact same issue but with other games as well such as Modern Warfare. Per the error above, the 0xc0000374 code means it's a status_heap_corruption. There can be many causes of this problem such as a problematic executable (e.g. ffxiv_dx11.exe), corrupted windows install (ntdll.dll), bad drivers (maybe Nvdia in my case) and other contributing factors. I feel like I've ruled out the graphics driver as I've tried 3 ages of driver. I also rolled back my Windows Update to two previous versions and still experienced errors. I'm leaning on either something is wrong with my Windows install that is conflicting with the 5.1 version of FFXIV (since I played the entirety of ShB with no issues until now) or it's something to do with the 5.1 files/executables themselves. I'll keep messing around since I can't do anything in-game with the constant crashing.