In steps...
Step 1 Whales , people who hold huge amounts of coins are selling
Step 2 People start sell out of FUD
Step 3 Automatically STOP LOST are triggered in the Exchanges and therefor the prices go super RED

This is a natural cycle, whales know this cycle and when the markets go to the button, come back and buy cheaper everything.
Also they prefer to buy new ICO in order to make new hypes.
If you are an investor invest to DIW and Trade.io and you will thank me one day.