What do you think the latest days big fluctuations are due to?
The price of Bitcoin rose too fast and many investors wanted to cash in profits. Traders tend to sell when the price spikes up high and will then buy back when the price dips back down. This is how they make profit from trading.
Im sure there are others that were alarmed by the huge price increase and expected a correction so they just took their profits.
Volatility is very common with cryptocurrencies. We see this happen quite often and fortunately the price of most of the major cryptocurrencies will eventually recover.