Bitcoin dropping recently occurred due to a number of reasons, primarily due to a lot of negative information from the press about cryptocurrency as well as Bitcoin that made many people skeptical about the currency. Second, there are many Bitcoin trading floors occupied by hackers and stealing large amounts of Bitcoin. And the last and most important reason is that the investment trend in Altcoin and ICO in 2018 is very high instead of investing in Bitcoin as in 2017.
You, me and others who have been known complete price factor of bitcoin but all the people comes as newbie does not know about it. They just fear because of these kind trollers words and jump to different altcoins.
This time we will find the bitcoin dumped due to hard fork as like every time we see but this hard fork completely affected the price suddenly bumped in the month November and December. Recently, you are seeing dump due to investor migration from bitcoin to different alts. Soon they will comes to btc once it bumped.