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. 
i guess maybe some big ICO projects like EOS have gathered too many ethers and they are dumping their eth on the market in exchange for cash or bitcoins. or maybe people are realizing the value of ethereum's competitors and are switching to them. competitors such as eos, neo, waves, bitshares also offer smart contract and the performance is better than ethereum blockchain.