Frequent Crashes/Freezes

EDIT: I am not sure how I can receive notifications from this post, but I will try to check this frequently.

I've been having this issue since last year mid-2020. I would be able to play for ~30 minutes/longer and then my game would freeze/crash. If on Dx11, I'll get a black screen iirc. If on Dx9, my screen will freeze, rarely, it will resolve itself. During such freezes, I can still hear the audio and alt-tab.

Recently, I fixed my VCore to 1.28 instead of Auto. Now, when I crash, my whole PC starts lagging out and I have to force shut-down. This makes me think it could be partly a CPU issue? I will try reverting to the original VCore settings.

A few of my games also suffer from a similar issue - some of them crash entirely. I do not think lowering the graphics affects it very much.

This is extremely frustrating. My GPU can run games at high performance, but it seems to crash frequently too. This is despite my underclocking/limiting power to GPU.

Happy to provide more details upon request.

Attempted:
1. Clean installing the latest NVIDIA driver
2. Clean installing FF14
3. Clean installing OS
4. Underclocking GPU Core Clock / Memory Clock by 60 MHz/ 100 MHz respectively
5. Playing on Dx9
6. Disabling overlays (Game Bar / Steam / Discord)
7. Playing without Chrome in the background
8. Playing with Fast Boot disabled.


Date & Time: 12/6/2021
Frequency: Every hour minimally
World Name: Tonberry
Character Name: Juniper Hale
Party or Solo: Both
In-Game Time: Anytime
Area and Coordinates: Anywhere, but generally in battle


GPU:NVIDIA GeForce GTX 1080 Ti
Driver Version:27.21.0014.6677
CPU:Intel(R) Core(TM) i5-9600K CPU @ 3.70GHz (6 CPUs), ~3.7GHz
RAM: 16 GB
Hard Drive:
OS: Windows 10 Pro
OS Version: 20H2
Graphics Settings: High (Desktop)
FPS Limit: set to 165 Hz / G-Sync

Good morning and thank you for posting on the Final Fantasy XIV Technical Support Forums.

Does this crash happen when Final Fantasy XIV is the only program running? Also, could you provide a system report? Simply go to the 'Config' option on the Final Fantasy XIV launcher and to the right of 'System Information' click on 'Display.'

Thank you for visiting the Final Fantasy XIV Technical Support Forums.

Thanks for the response. Seems like an issue with FF14 responding to my GPU instability. Undervolting/Underclocking does not particularly help. I will try to tinker with the settings to see if I can get better stability. Instances like The Burn or The Ghimlyt Dark are unstable for me.