(CNBC) Investors should be careful as the recent spike in market volatility is far from normal, according to the manager of the California State Teachers’ Retirement System, which has more than $200 billion in assets. “The last few days have been abnormal volatility,” Christopher Ailman, chief investment officer at CalSTRS, told CNBC during a special aired Thursday night. “The volatility we saw earlier in October and November, I went on and said that was expected. That’s typical when you have a bull market that’s so old and so late in the economic cycle. But the last few days are abnormal because the machines are really picking over more than human beings.”