It's not manipulation, it's hedging. Since institutions manage big funds and large amounts of money, every order they make creates a massive reaction in the fluctuation in price. They short in certain rice points and then also buy to regain back their losses. As their orders are pouring in, retail traders would also put up their orders that's where institution takes away the money of normal and retail traders.
This is the reason you should trade well established coins like bitcoin which its price cannot be easily manipulated. The second thing is that if you are a good trader, you will not think about this but think about using a well formulated strategies to make money from trading through technical analyses. Traders that are losing are the ones that do not know much about trading, even they are just losing even if there is no manipulation.