DXVA2 is used since Windows Vista, there should be no issue on contemporary rigs. Check out About DXVA 2.0 (Windows)
Since you are using the latest Windows version, you can use the new GPU monitor built into task manager.
Press SHIFT+CTRL+ESC to open task manager, select performance tab, select GPU.
Run a problematic video in an endless loop and observe "video decode", "video processing" and "GPU memory".
The culprit should reach 100% when your computer freezes.
Otherwise double-check the same movie in VLC or Windows' built-in media player.
I was able to pull out that problem again, and yes, video processing, video decoding and 3d goes up 100% then the screen freeze. I think it has something to do with the EVR (Custom Presentation) mode in MPC-HC, it didn't happen in the normal EVR mode. The problem doesn't happen with video play directly on Youtube, and also with Windows' Movies & TV app. So it is a software problem.
Before switching DXVA2 Native (after digging around on how to enable that), I use DXVA copy-back, which as I know, those two are different, and didn't have any problem for half a year.
By a way, thanks for telling me.