There are several reasons but the most intriguing one is the "US - China Trade war".
There are a lot of speculations in market that due to the US trade sanctions on China, a lot of trading has gone underground and is happening through "Cryptocurrency". Therefore the Trump administration is trying to ban crypto which has caused a plummet in the price.
Just my humble opinion. You guys can disagree.
I'd say that the trade war is most certainly causing an impact on the prices as well. Naturally, a lot of firms would want to protect their income and they are doing that by trying to find alternative ways to trade. But how would the Trump administration be able to take effective action to ban crypto? I can't really see a feasible course of action that would result in the direct decrease in price.
I think it's more of a recovery stage, still happening from the bubble last winter. The 6k region is the borderline for profitability of miners, so it will hold. It needs to hold.