The crypto-currency market has high volatility. One of the main reasons for such extreme volatility is the lack of liquidity. The volume of daily trading bitcoin and other major coins significantly decreased after a major correction in January, along with the price of bitcoin
Obviously the market prices is depending on supply and demand so its normal for the price to drop depending on the season where investors will invest even more or hold their coins and you can use that volatility in order to earn more profit depending on how good you are in trading.