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

Market moves up and down, when a price move up it will later come down to find a new floor, I don't know how sound your trading skill is but this is something you need to learn fast because everything that goes up will come down, it just depend on how the market adjust to the correction. You need to understand this that Ethereum price has lost 89% of its value before and can do it again likewise BTC so have this at the back of your mind