even though there is positive news, but the negative news has a greater effect for now, the current price has started to improve, but I am afraid this is only a correction before continuing the trend
Yep, negatives news keep coming and we can't avoid those stuff. Hacking, terrorism, bad news about Bitcoin and stuff are the factors why Bitcoin falling down until now for more than 3 months.
It doesn't fall anymore but the simplest explanation is that there are times when sellers outweight the buyers by a big margin. Since the market doesn't have a huge volume it is easily manipulated by the rich people who would like to change the direction of the market.
Sometimes that happens all of a sudden and the price goes down very quickly like it happened couple weeks ago. Those rich people know what they are doing and they can actually afford to "lose" money right now in order to make money later on.
Their system works because they can afford this, we can't afford these drops whereas they know if they "lose" money right now they can cripple the market and make the price lower and pick up more bitcoins later on and wait for another increase. Do you really believe this is a coincidence that ETF's will start next month? No. They have done this and picked more bitcoin up so they can profit after ETF's start.