BTC has received too much attention and is easily influenced by the outside world.
Because of a lot of false news, the investor's mind was disturbed and the wrong operation BTC was made.
The price that causes BTC has great fluctuation!
Things have changed now, Bitcoin is not just influenced by bitcoin geeks anymore. The rising market cap clearly shows that so many new users are entering the market, Hence increasing the volatility also. Market is influence by many factors, so resulting in volatility always despite volume is low or high you need to get used to it. Coming 2018 things seem to be more volatile simply as volume is more and even the small volatility can result to change in big numbers but the volatility can comparability same over the years.