When the volume of bitcoins rolling in the market decreases because of the control of whales of their holdings like selling some percentage, that affects also the possessions of many bitcoin investors, would probably shake the market price of the bitcoin to dip, therefore the strength of bitcoin relies on the stability of the volume and its reputation
i think that such a small fluctuation is always there in bitcoin market, i think that bitcoin price will hopefully continue to increase its price, and hope that very soon we will see crossing the 10000$ figure, and even after that the price will continue increasing and not going to fell down any more.