This should be a supply and demand problem affecting the bitcoin price, because there is and inflation in prize more customers with large quantity of Bitcoin will want to sell for profit and costumers buying are few because the inflation of prize,so the supply is now more than the demand.
I also think the recent rise is due to the Bitcoin Gold fork. People want to get some bitcoin Gold, so they bought some bitcoin. Now they got it, so they sell bitcoin. The price has dropped.