I've been monitoring the market for a couple of months now. Most of the coin value rely on the price of Bitcoin. If the BTC price goes up, every altcoins will follow and if it will goes down, the price of every altcoins will goes down as well. But the question is, Bitcoin price/value is still going up but the price/value of every altcoins especially Ethereum goes down. How did this happen? Any logical or scientific basis to explain this. As of now, I am still confuse. 
Maybe most of the people are selling their Altcoins to buy Bitcoins so that they could be on board if the Bitcoin price will start to soar again.There are lot of predictions in which most of the experts says Bitcoin will become ATH again before this year would end and we are now heading for August in which a few months left before December so i think these Bitcoin predictions will attract most of the people to choose Bitcoin over Altcoins.