From USD2000 dropped down to USD1400 for only 2 days?
Anyone knows what is happened?

I am not surprised by the correction taking place in the crypto market, because fluctuations are nothing new in the crypto market. In these 2 days it's not only Ethereum that has experienced a correction, most of the coins experienced a very drastic drop in price, including Bitcoin. People who already understand the movement of cryptocurrency are already preparing themselves to face a correction, because when the correction occurs they will buy to get a profit when the market price has returned to improvement.