Video Stall issues since Win10 Anniversary?

For the last week or so, the reliability of the video has been quite unstable. It’s almost as if the CPU usage maxes out, and the program crashes (clicking on the screen brings up the “has stopped responding” box), even though the audio continues – if I wait ~5-30 seconds, it will typically re-sync, although it has crashed completely a few times (after being basically bulletproof since the spring). I almost exclusively use x265, and it’s not a file corruption issue (they play perfectly in MS’s “Movies & TV” – ok, I lied, it does the same thing… $#!^). I had the release from April, and just upgraded to v17.B2 hoping that would solve the issue – and obviously it hasn’t. Even more inconsistently, I can skip back 10 seconds or a minute, and the video will not stall in the same area. I have run the file from the local drive, from a NAS, and even from my RAMdrive, with no differences.

As I think more about it, when playing .avi or .mp4, the stalls don’t happen. Is there something in the HEVC/x265 codec that could be causing issues as of late? I’ve been x265-almost-exclusive for several months, and this has been the first issues.