Mirage Memory Leak? Extended Playtime causes Game to Stop Rendering Graphics & Lock Up

Here are some details...

It's important to note that this ONLY occurs within a Mirage section of a map, or within the Mirage itself.

Extended play sessions, approximately 2-3 hours, results in spinning GGG gears, black screen and concerning spikes in CPU -- the in-game graph reads something like 1200ms.

Pausing the game, eventually the graphics return, until unpaused where it goes back into spinning gears and eventually the game either crashes or I have to Alt-F4.

This has been present the whole league and this is the first league where this has occurred. I perused the forums to see if there were other instances of this and there were, but I initially decided to wait and see if a patch fixed it.

Troubleshooting I've tried:

Full, clean uninstall/reinstall of video card drivers
Cleared shader cache
Full uninstall/reinstall of the game, changed directories
Many tweaks of settings, following guides in the forums and elsewhere

Hardware:

AMD Ryzen 9 5900X 12-Core
Radeon 6900XT
32GB RAM

If you need more hardware information or whatever, I'll edit this post.