When many people sell buy orderook is cleaned up and price goes down. We are in a period of bear market (sellers are more than buyers) and pressure is really high. People are selling on news, they fear government regulations and maybe the bubble has burst (too much manipulation and whales like MtGox trustee selling, USDT uncertainty and lack of audit and so on). There are also good news like Bittrex FIAT banking and Binance banking announcement but 'mysterious whales' are keeping selling, while the hashrate is still at record levels.