Low volatility doesn't mean stable. Bitcoin has experienced periods of low volatility many times, however this doesn't mean bitcoin is stable, not even close. We all know it doesn't take much for bitcoin to explode, either up or down. That's absolutely still in the cards, I mean everyone is waiting for the next bull run and some people are waiting for a big crash.
It's like saying, this bomb is stable because it hasn't exploded yet.
Well,you have a point because bitcoin was created as volatile and unstable digital currency. It means it is still changing it's price even a little. And now we can see that the value of bitcoin suddenly fallen.