BLUF - don’t maximize your UE4 UI window, hit that little multiple window or “restore down” button and then just grab the corner and scale the window up to fill your screen.
Tried all the stuff on these posts and found that this fixes it for me.
When the Unreal UI is maximized in 4.24 and 4.25, the UI itself stutters on my desktop and completely crashes with the D3D device error on my laptop. I think it has something to do with fullscreen mode interacting with the integrated intel card on my laptop even though I have a 1060 in it. I’m going to make a video showing this issue and how consistently I can recreate and fix this problem and them submit it to epic to see if they can fix the underlying problem since it only happens on the latest two engine versions.
Really hope this helps,
Edit: to further my suspicion, running OBS (to try and capture the bug) fixes the issue too and OBS only works if it is set to use the integrated card. Immediately upon closing OBS and trying to interact with maximized UE4 UI starts crashing stuff again.