dont understand why people are selling before great news coming the next few days! Or they are selling and hoping to buy at lower price , it could be possible this second options....
I would not leave any coin in a exchange.You can lose everything
if you would not how can many people make trade? i would not trade on all exchange but just the trusted one.
Don't trade in unknown exchange sites if you don't want to lose your coins and also try to 2fa your account in any exhanger site.
So far, the best exchange sites to me are Bittrex, Poloniex and the new exchange site Liqui.