People who have the large quantities of bitcoin or who owns it has dumping and pumping it to control how the market price of bitcoin revolves and we people who just hold a small or quarter of bitcoin has nothing to do with it but to bear with it. Im not sure about how they manage to do it or they are just a circle of friends that's manipulating the market price and volume of bitcoin. Of course the regulations around the bitcoin's legality world wide is surely affect it too.