I had to upgrade back to 6.10-rc2 (I tried the tpm bios and Windows won't boot without it and I couldn't be bothered with trying to do a fresh install of everything)
I have left the install as stock so it has loaded the i915 drivers and it has been up for nearly a day so far. It still needs way more time to be labeled as stable. But considering last time it was a matter of hours before it locked up I am cautiously hopeful. Perhaps it was installing GPU-TOP that caused the crashing?
Incidentally, hardware transcoding is working, it just takes a second for Tautulli to show that the transcode is hardware accelorated.
I will give it the weekend and if it locks up again I will submit the bug report.
The only thing that isn't working for me is the HDR tonemapping on plex, but I believe that is a Plex driver issue rather than Unraid specific.