I half-suspect that your graphics card starts overheating at some point, which is why lowering your settings gives it time to cool down while you fiddle with it, and then it eventually returns.
I hadn't considered that. Some kind of weird thermal throttling. I don't think that's the issue, though, since I've had the glitch occur on "cold" starts.
Then yeah, not sure. Could be anything ranging from the driver to any number of issues in the game code — it is quite new, after all, probably at least a few hotfixes away from being entirely stable.
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