You and I are VERY similar in that way. I was literally shopping for new parts last night for a whole new PC since this is effectively a motherboard problem.
With a decent sleep behind me, I got back at it today and flashed every BIOS from my manufacturer, backward from the newest, until I arrived at one that didn't have the GPU issue which I thought was caused by the moth. It turns out that it was not, in the end, the bug's fault.
Having started on Friday morning with the very first manufacturer BIOS, which shipped with the board, I knew that it worked in a stable fashion but was missing a key feature for my new hardware. By the time I found one that once and truly didn't exhibit the issue that was crashing my GPU, I was back to the 3rd BIOS release and now I think we are at "stable."
The board in question, in case anyone finds this on a search engine, is the Gigabyte Aorus Z690 Ultra DDR4, and the shipped bios is version F3. My video card is a Gigabyte RTX 3060Ti, and the bug causing hard locks / crashes is present in every BIOS from F20 and upward. Version F6 has another issue I didn't bother to diagnose that was causing instability for unknown reasons. F8, however, works just as well as F3 so far, though I want the rest of the weekend to test. So far none of the F20 series issues are in the journal though, so I think that's where the issue was introduced.
And for Gigabyte haters, I feel you, but it's a SFF build and I needed a mITX Z690 board and a 3060Ti that was short enough to fit in a NF200 case built at the peak of the GPU shortage which only made things more complicated. My options were serendipitously limited to that manufacturer. :)
Using Connect right now. What I really care about is a Frontpage widget like RIF. I'm holding open real estate on the main screen of my Android. Basically the first dev to have that and a decently usable interface (bonus points for a "black" mode) gets the space :)