[MrBfJohn]

I'm also having lots of image stuttering and audio starting good, but gradually moving out of sync. Again, older builds work fine. The last good build for me was 20161208.
I'm using a couple of Intel NUC 2820's, and they both have the same problem. Both using latest BIOS and drivers.
Here is a debug log in case it will help solve the issue.
Debug Log

I'll revert back for now and try newer builds as they become available.

EDIT... I also noticed that 2 of my CPU cores are always at 100%, and 2 are always at 0%. May be nothing, but I thought I'd mention it.