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

The cause is for the reduction of bitcoin price.When the price of bitcoin had increased to high value,you can able to see good rise in the price of Ethereum also.But you should need of patience.Keep buying Ethereum at all low price.You may get shocked at one time,the returns you are getting from the investments.It will make you happy at some moment.
The nature of this business is very volatile. If you are unable to manage
situation chances that you'll be panicking from how things are moving by now.
But to those who understand how to take advantage of this correction, buying is the first option after analyzing the possibilities, for now it
mostly cause by traders who managed to buy at the dip and now cashing out and enjoying the profits that they've gained from that last pumped.