It happens to me almost all the time, especially when I exit a vehicle. It gets annoying and can be frustrating when you are suddenly engaging half a dozen zeds with more on the way and no backup. Then you hear a loud thump and groans and your follower(s) are on the ground dazed and take a couple of seconds to recover and assist you. Oh, and the jump scares, did I mention the jump scares? This bug or whatever it is they are trying to correct needs fixed.