Devils advocate - it is possible the large swings are also because it does not have the counterbalancing effect of a large economy on it, and as it gets used more often that will change.

Being able to buy something I want today, because the price went up from yesterday, or saving today when I would have spent, because the price has dropped today causes a regulating effect.

Right now the usage of it is low, small changes in this equation have an outsized effect.