Heya, I had my screens start going black during renders too, and have managed to resolve it.
Here are a few things you can try; I did all three:
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Do you have an autobackup programme like Backblaze running? Turn it off for the render, it’s probably causing bottlenecks.
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Is your system overheating? My temps appeared all good, but the room does heat up significantly when rendering and a random spike may have been tripping it, so I opened the window just in case. A couple of degrees can make all the difference haha!
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Try stopping all other unnecessary processes on your PC. In particular, shrink your UE viewport right down before rendering, and position it so that it’ll be hidden behind the render preview, to save your GPU and extra unnecessary work, just in case.
The black screen crashes were too random for me to replicate and test all of this, but I’m 99% sure Backblaze was the problem in my case; I’m pretty confident I’d had it turned off previously when I rendered without issue too.
I’m not sure about the speckling though, it might actually lead more towards GPU overheating issues in your case though, if its something that gets worse over time. Make sure drivers are up to date and that temps are good.