I think it only dumps hard right after a huge price bubble which has happed a couple of times just before Christmas. This year we did not see a price bubble so dont expect a big price drop.
I wouldn't be so confident about it though even if the market seems too unstable there's still could a chance that a huge price drop would happen in the future. Although this is December and it is expected already that most people will be cashing out just to buy some present for the upcoming holiday season.