I never know of a case when termination was coming out of the blue. I had to terminate a few dozen people over the past 20 years, it was not a surprise for anyone and many people even though "why did it take so long?" in some cases. In every single case was a problem with the recruiting (not interview) process. 15-20 years ago it was hiring the cheapest people possible, in the past 5 years it is hiring any people to meet diversity quota, in both cases skills were far from requirements and the desire to learn was almost zero.