That's just natural phenomenon that will occured in this trading term of cryptocurrencies. There's the time when people need/ already satisfied with the profit they earned. And there's the time newcomer will buy the coin itself. It will back rises. And from time that you post this topic and right now. Bitcoin already surpasses its all time high 
#CMIIW
Yes the current price is $15,370.02 and that's so much impressive.I think dumping is just a part of the movement of bitcoin and that's normal.But i guess with this time around,no dumping of bitcoin will appear until the end of this month. #CMIIW