I will not invest bitcoin at the moment, it puzzles me. 2017, bitcoin prices will increase as bitcoin loans are the primary currency. In 2018 I saw a lot of bitcoin imbalances at times when it came to the point where I could not believe 
Yes, I also think that it is unusual thing to happen on btc market. BTC is already popular this days but how come the price is falling down non-stop. I think it is better hold now and wait for the price to stabilise a bit.
unusual? no it isnt. it is pretty normal to see that bitcoin is decreasing and that is due to many people sold their bitcoins. you know that when the demand is lesser than the supply ,
the value of the coin will also decrease or else will become stagnant or stuck in its current price. bitcoin is still popular even if its price is decreasing and being popular doesnt mean it can always increase.
bitcoin is a highly volatile coin , that is why it can always decrease or increase without prior notice to the public.