I had it happen. When it happened, my game has never been the same. For the last few months since the update only I seem to have got, I can only run the game in DX11 and get around 25 FPS during hordes. In DX12 my screen freezes every 5 seconds or so. It’s even noticeable on other people’s screens when I’m hosting. As all the mobs will freeze and and stand in place when I get the glitch.
I tried working it out with a Fatshark Dev, but I guess he gave up. It gets fixed with some patches and then broken again with the next.